摘要:
A composition and method of preventing or inhibiting tumor growth and, more particularly, of treating a malignant tumor, using prodrugs of plant-derived compounds and derivatives is disclosed. In the method, a composition containing betulinic acid or a betulinic acid derivative is administered in a prodrug form to release betulinic acid or a betulinic acid derivative in vivo at the tumor site.
摘要:
A composition and method of preventing or inhibiting tumor growth and, more particularly, of treating a malignant tumor, using prodrugs of plant-derived compounds and derivatives is disclosed. In the method, a composition containing betulinic acid or a betulinic acid derivative is administered in a prodrug form to release betulinic acid or a betulinic acid derivative in vivo at the tumor site.
摘要:
A method of preparing (.+-.)-calanolide A, 1, a potent HIV reverse transcriptase inhibitor, from chromene 4 is provided. Useful intermediates for preparing (.+-.)-calanolide A and its derivatives are also provided. According to the disclosed method, chromene 4 intermediate was reacted with acetaldehyde diethyl acetal or paraldehyde in the presence of an acid catalyst with heating, or a two-step reaction including an aldol reaction with acetaldehyde and cyclization either under acidic conditions or neutral Mitsunobu conditions, to produce chromanone 7. Reduction of chromanone 7 with sodium borohydride, in the presence of cerium trichloride, produced (.+-.)-calanolide A. A method for resolving (.+-.)-calanolide A into its optically active forms by a chiral HPLC system or by enzymatic acylation and hydrolysis is also disclosed. Finally, a method for treating or preventing viral infections using (.+-.)-calanolide A or (-)-calanolide A is provided.
摘要:
A composition and method of preventing or inhibiting tumor growth and, more particularly, of treating a malignant tumor, using prodrugs of plant-derived compounds and derivatives is disclosed. In the method, a composition containing betulinic acid or a betulinic acid derivative is administered in a prodrug form to release betulinic acid or a betulinic acid derivative in vivo at the tumor site.
摘要:
The present invention relates to methods for preparing 2,2-dimethyl-5-acyloxy-10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (5) and 2,2-dimethyl-5-hydroxy-10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (6) and their use as intermediates for the synthesis of antiviral calanolide compounds. For example, Fries rearrangement on compound 5 or Friedel-Crafts reaction on 6, yields intermediate 2,2-dimethyl-5-hydroxy-6-propionyl-10-propyl-2H,8H-benzo[1,2-b:3,4-b′]dipyran-8-one (4), which, in turn, can be converted to (+)-calanolide A and (−)-calanolide B. The coupling of compound 6 with the appropriate chiral molecule under Mitsunobu or nucleophilic displacement leads to the asymmetric synthesis of antiviral calanolide compounds.
摘要:
Unprotected adenine, 6-chloropurine, 2,6-diaminopurine, and 2-amino-6-chloropurine have been directly coupled with 2-(diethoxyphosphonomethoxy)ethanol under a disclosed method to provide acyclic phosphonate nucleotide analogues which are intermediates for antiviral agents such as 9-�2-(phosphonomethoxy)ethyl!adenine (PMEA) and its analogues having a structure of formula I: ##STR1## wherein Z represents N or CH; R.sub.1 represents hydrogen, alkyl, aryl, or arylalkyl; R.sub.2 and R.sub.3 are independently selected from H, OH, halo, NH.sub.2, C.sub.6 H.sub.5 CH.sub.2 O, or R.sub.4 R.sub.5 N wherein R.sub.4 and R.sub.5 are independently selected from alkyl, aryl, or arylalkyl.
摘要:
The present invention comprises lupine-type triterpenoids that inhibit cell proliferations, in particular cancer and conditions associated with cancer. For example, associated malignancies include ovarian cancer, cervical cancer, breast cancer, colorectal cancer, and glioblastomas, among others. Accordingly, the compounds of the present invention are useful for treating, preventing, and/or inhibiting these diseases. Thus, the present invention also comprising pharmaceutical formulations comprising the compounds and methods of using the compounds and formulations to inhibit cancer and treat, prevent, or inhibit the foregoing diseases.
摘要:
The present invention relates to compounds and compositions useful in treating or preventing conditions and diseases related to Mycobacterium infection, and methods of use directed thereto.
摘要:
Calanolide analogues that demonstrate potent antiviral activity against many viruses are provided. Also provided is a method of using calanolide analogues for treating or preventing viral infections. The calanolide analogues provided are obtained via syntheses employing chromene 4 and chromanone 7 as key intermediates.
摘要:
A method of preparing (+)-calanolide A, 1, a potent HIV reverse transcriptase inhibitor, from chromene 4 is provided. According to the disclosed method, chromene 4 intermediate was subjected to a chlorotitanium-mediated aldol reaction with acetaldehyde to selectively produce (.+-.)-8a. Separation and enzyme-mediated resolution of (.+-.)-8a produced (+)-8a. Cyclization of (+)-8a under neutral Mitsunobu conditions followed by Luche reduction of (+)-7 produced (+)-calanolide A in high yield and enantiomeric purity. The method of the invention has been extended to produce potent antiviral calanolide A analogues.