摘要:
Compounds of formulae are usefull as intermediates in a process for the preparation of vitamin D 3 compounds of formula wherein
A is a single or a double bond; B is a single, cis-double, trans double or a triple bond; R 1 and R 2 are independently hydrogen, a C 1 -C 4 alkyl; R 3 and R 4 are independently a C 1 -C 4 alkyl, a hydroxyalkyl, and a haloalkyl.
摘要:
The novel fluorinated Vitamin D 3 analogs of formula wherein: X is (H,H) or =CH 2 ; R 1 and R2 are, independently of each other, hydrogen, (C 1 -C 4 ) alkyl or fluoroalkyl, or R 1 and R 2 together with C-20 form a (C 3 -C 6 ) cycloalkyl or cyclofluoroalkyl, or R 1 and R 2 together form =CH 2 ; R 3 and R 4 are, independently of each other, a (C 1 -C 4 ) alkyl or fluoroalkyl, or R 3 and R 4 together with C-25 form a (C 3 -C 9 ) cycloalkyl or cyclofluoroalkyl; A is a single bond or a double bond; and B is a double bond or a triple bond; except that: (i) when X is =CH 2 , R 3 and R 4 are each CF 3 , A is a double bond and one of R 1 or R 2 is hydrogen, then the other of R 1 or R 2 cannot be CH 3 ; (ii) when X is =CH 2 , R 3 and R 4 are each a (C 1 -C 2 ) alkyl, A is a double bond and R 2 is hydrogen, then R 1 cannot be CH 3 ; (iii) when X is =CH 2 , R 3 and R 4 are each a (C 1 -C 4 ) alkyl, A is a double bond and R 1 is hydrogen, then R 2 cannot be CH 3 ; (iv) when X is =CH 2 , one of R 3 or R 4 is a CF 3 , A is a double bond, R 1 is CH 3 and R 2 is hydrogen, then the other of R 3 or R 4 cannot be CH 3 ; and (v) when X is (H,H), R 3 and R 4 are each CF 3 , A is a double bond, B is a triple bond and R 2 is hydrogen, then R 1 cannot be CH 3 , and the compounds of the above formula I wherein: X is (H,H) or =CH 2 ; R 1 and R2 are, independently of each other, hydrogen, (C 1 -C 4 ) alkyl or fluoroalkyl, or R 1 and R 2 together with C-20 form a (C 3 -C 6 ) cycloalkyl or cyclofluoroalkyl, or R 1 and R 2 together form =CH 2 ; R 3 and R 4 are, independently of each other, a (C 1 -C 4 ) alkyl or fluoroalkyl, or R 3 and R 4 together with C-25 form a (C 3 -C 9 ) cycloalkyl or cyclofluoroalkyl; A is a single bond or a double bond; and B is a double bond or a triple bond; except that where R 3 and R 4 are each CF 3 and A is a double bond and B is a triple bond and R 2 is hydrogen, then R 1 cannot be CH 3 , are useful in the treatment of osteoporosis.
摘要:
The novel fluorinated Vitamin D 3 analogs of formula wherein:
X is (H,H) or =CH 2 ; R 1 and R2 are, independently of each other, hydrogen, (C 1 -C 4 ) alkyl or fluoroalkyl, or R 1 and R 2 together with C-20 form a (C 3 -C 6 ) cycloalkyl or cyclofluoroalkyl, or R 1 and R 2 together form =CH 2 ; R 3 and R 4 are, independently of each other, a (C 1 -C 4 ) alkyl or fluoroalkyl, or R 3 and R 4 together with C-25 form a (C 3 -C 9 ) cycloalkyl or cyclofluoroalkyl; A is a single bond or a double bond; and B is a double bond or a triple bond; except that:
(i) when X is =CH 2 , R 3 and R 4 are each CF 3 , A is a double bond and one of R 1 or R 2 is hydrogen, then the other of R 1 or R 2 cannot be CH 3 ; (ii) when X is =CH 2 , R 3 and R 4 are each a (C 1 -C 2 ) alkyl, A is a double bond and R 2 is hydrogen, then R 1 cannot be CH 3 ; (iii) when X is =CH 2 , R 3 and R 4 are each a (C 1 -C 4 ) alkyl, A is a double bond and R 1 is hydrogen, then R 2 cannot be CH 3 ; (iv) when X is =CH 2 , one of R 3 or R 4 is a CF 3 , A is a double bond, R 1 is CH 3 and R 2 is hydrogen, then the other of R 3 or R 4 cannot be CH 3 ; and (v) when X is (H,H), R 3 and R 4 are each CF 3 , A is a double bond, B is a triple bond and R 2 is hydrogen, then R 1 cannot be CH 3 , and the compounds of the above formula I wherein: X is (H,H) or =CH 2 ; R 1 and R2 are, independently of each other, hydrogen, (C 1 -C 4 ) alkyl or fluoroalkyl, or R 1 and R 2 together with C-20 form a (C 3 -C 6 ) cycloalkyl or cyclofluoroalkyl, or R 1 and R 2 together form =CH 2 ; R 3 and R 4 are, independently of each other, a (C 1 -C 4 ) alkyl or fluoroalkyl, or R 3 and R 4 together with C-25 form a (C 3 -C 9 ) cycloalkyl or cyclofluoroalkyl; A is a single bond or a double bond; and B is a double bond or a triple bond; except that where R 3 and R 4 are each CF 3 and A is a double bond and B is a triple bond and R 2 is hydrogen, then R 1 cannot be CH 3 , are useful in the treatment of osteoporosis.
摘要:
The invention is directed to a process and intermediates for the preparation of benzopyrans such as racemic-6-acetyl-7-[5-(4-acetyl-3-hydroxy-2-propylphenoxy)pentyloxy]-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid.
wherein A is a 23,24-bisnorsteroid or a 23,24-bisnor-9,10-secosteroid radical, wherein the free valence bond is in the 22-position and wherein any hydroxy groups present are protected; R₁ is hydrogen, carboxy, lower alkoxycarbonyl, lower alkylcarbonyl or unsubstituted or substituted lower alkyl; and R₂ is hydroxyl, lower alkoxy, or unusbstituted or substituted lower alkyl, can be prepared from compounds of formula AX wherein X is halogen, and compounds of formula
The compounds of formula IV can be converted into calcitriol and related compounds.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von 2′,3′-Dideoxycytidin, dadurch gekennzeichnet, dass man a) die 4-Aminogruppe von Cytidin mit einer geeigneten Schutzgruppe schützt, b) das geschützte Cytidin zum entsprechenden Bromacetatderivat bromacetyliert, c) das Bromatom und die Acetoxygruppe aus dem Bromacetat reduktiv eliminiert um das 2′,3′-Didehydroderivat zu erhalten, d) das 2′,3′-Didehydroderivat hydriert und e) aus dem so erhaltenen an der 4-Amino und 5′-Hydroxygruppe geschützten 2′,3′-Dideoxycytidin die Schutzgruppen entfernt, um 2′,3′-Dideoxycytidin zu erhalten; sowie neue in diesem Verfahren vorkommende Zwischenprodukte.
摘要:
Die Erfindung betrifft ein Verfahren zur Herstellung von 2′,3′-Dideoxycytidin, dadurch gekennzeichnet, dass man
a) die 4-Aminogruppe von Cytidin mit einer geeigneten Schutzgruppe schützt, b) das geschützte Cytidin zum entsprechenden Bromacetatderivat bromacetyliert, c) das Bromatom und die Acetoxygruppe aus dem Bromacetat reduktiv eliminiert um das 2′,3′-Didehydroderivat zu erhalten, d) das 2′,3′-Didehydroderivat hydriert und e) aus dem so erhaltenen an der 4-Amino und 5′-Hydroxygruppe geschützten 2′,3′-Dideoxycytidin die Schutzgruppen entfernt, um 2′,3′-Dideoxycytidin zu erhalten; sowie neue in diesem Verfahren vorkommende Zwischenprodukte.