摘要:
A process for the preparation of 1-ethynyl-3,3-dimethylcyclohexan-1-ol from dimedone by a reaction sequence of reduction and ethynylation and its further transformation into green ketone.
摘要:
13,13-Dimethyl-des-C,D analogs of 1α,25-dihydroxy-19-nor-vitamin D3 compounds and topical composition dosage forms thereof, and methods of treating skin conditions thereof. Exemplary active pharmaceutical ingredients include (1R,3R)-5-[(E)-(S)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-methylene-cyclohexane-1,3-diol, (1R,3R)-5-[(Z)-(S)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-methylene-cyclohexane-1,3-diol, (1R,3R)-5-[(E)-(R)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-methylene-cyclohexane-1,3-diol, and (1R,3R)-5-[(Z)-(R)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-methylene-cyclohexane-1,3-diol.
摘要:
13,13-Dimethyl-des-C,D analogs of 1α,25-dihydroxy-19-nor-vitamin D3 compounds and topical composition dosage forms thereof, and methods of treating skin conditions thereof. Exemplary active pharmaceutical ingredients include (1R,3R)-5-[(E)-(S)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-metylene-cyclohexane-1,3-diol, (1R,3R)-5-[(Z)-(S)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-metylene-cyclohexane-1,3-diol, (1R,3R)-5-[(E)-(R)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-metylene-cyclohexane-1,3-diol, and (1R,3R)-5-[(Z)-(R)-11′-hydroxy-5′,5′,7′,11′-tetramethyl-dodec-2′-enylidene]-2-metylene-cyclohexane-1,3-diol.
摘要:
A method for purifying isopulegol is disclosed, comprising deep cooling isopulegol mainly composed of (-)-n-isopulegol in a solvent for deep cooling mainly comprising acetone to obtain (-)-n-isopulegol having a chemical purity of not less than 99.7% by weight and an optical purity of not less than 99.7%e.e. The thus purified (-)-n-isopulegol is odorless and gives a feeling of freshness, crispness and coolness to a citrus perfume composition.
摘要:
Novel processes for the preparation of lactam- and lactone-containing macrocyles are provided. In preferred embodiments, rapamycin and demethoxyrapamycin are prepared by a convergent synthesis regime. Intermediates useful in the synthetic processes are also provided.
摘要:
A process is disclosed for the removal of the 4-protected hydroxy group from compounds of the following formula: ##STR1## where A is --COOAlkyl and B is hydroxy, or A and B together represent either oxo or .dbd.CHCOOAlkyl, where X.sup.1 and X.sup.2 are the same or different and represent hydrogen or a hydroxy-protecting group, and where X.sup.3 is ##STR2## with a hydrogen radical source, such as tributyltin hydride or tris(trimethylsilyl)silane, and a radical initiator, such as AIBN or irradiation.
摘要:
The invention describes intermediates for use in the synthesis of 1.alpha.-hydroxy-19-nor-vitamin D compounds. The intermediates have the following formula: ##STR1## The disclosed process includes (a) the construction of a 5,8-diol-6-yne intermediate by joining ring-A and ring-C/D portions of the desired end product via the condensation of an acetylenic derivative containing the C/D-ring portion of the desired end product with a cyclic dihydroxy ketone representing the A-ring of the desired end product; (b) the partial reduction of the 6,7 acetylenic triple bond linkage between the A and C/D ring portions to obtain a 5,8-diol-6-ene intermediate; and (c) the reductive removal of the 5,8-oxygen functions to generate the required 5,7-diene end product from which the desired 7-trans(7E)-isomer is purified directly, or after optional double bond isomerization of the 7-cis(7Z)-isomer employing a novel thiophenol-promoted isomerization step.
摘要:
A synthesis of 1.alpha.-hydroxy-19-nor-vitamin D compounds comprises (a) the construction of a 5,8-diol-6-yne intermediate by joining ring-A and ring-C/D portions of the desired end product via the condensation of an acetylenic derivative containing the C/D-ring portion of the desired end product with a cyclic dihydroxy ketone representing the A-ring of the desired end product; (b) the partial reduction of the 6,7 acetylenic triple bond linkage between the A and C/D ring portions to obtain a 5,8-diol-6-ene intermediate; and (c) the reductive removal of the 5,8-oxygen functions to generate the required 5,7-diene end product from which the desired 7-trans(7E)-isomer is purified directly, or after optional double bond isomerization of the 7-cis(7Z)-isomer employing a novel thiophenol-promoted isomerization step.
摘要:
Acetylenic derivatives of general formula ##STR1## in which R.sub.1 denotes a hydrogen atom or a phenyl radical or a radical of general formula ##STR2## in which R.sub.2 and R.sub.3, which may be identical or different, denote a hydrogen atom or a saturated or unsaturated aliphatic radical, substituted if appropriate, or form together a cycloaliphatic radical, R.sub.4 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical, a hydroxy, alkyloxy, methanesulphonyloxy, benzenesulpnonyloxy or p-toluenesulphonyloxy radical, R.sub.5 denotes a hydrogen atom or a saturated aliphatic radical, R.sub.6 denotes a hydrogen atom or a saturated or unsaturated aliphatic radical are made by reaction of an acetylenic derivative of general formulaR.sub.1 --C.tbd.C--H (III)with an allyl derivative of general formula ##STR3## in the presence of a cuprous salt and an anhydrous organic base. The compounds of formula (I) are useful in organic synthesis, in particular in the preparation of the vitamins A and E.
摘要:
The invention relates to isomeric 1-alkyl/alkenyl-2,2,4(2,4,4)-trimethyl cyclopentan-1-ols corresponding to general formulae I a/b below ##STR1## in which R is C.sub.2-5 alkyl or a C.sub.3-5 alkenyl; the use of compounds of the same formula in which R is C.sub.1-5 alkyl or C.sub.2-5 alkenyl as perfumes in compositions containing active chlorine or capable of generating active chlorine; and methods for their preparation.
摘要翻译:本发明涉及对应于下文通式I a / b(I)的异构体1-烷基/链烯基-2,2,4(2,4,4) - 三甲基环戊烷-1-醇,其中R是C2 -5烷基或C3-5烯基; 在含有活性氯或能够产生活性氯的组合物中使用其中R为C1-5烷基或C2-5烯基的相同式的化合物作为香料; 及其制备方法。