25-hydroxydihydrotachysterol2 an innovative synthesis of a key metabolite of dihydrotachysterol2
摘要:
A new synthesis of 25-hydroxydihydrotachysterol2 is described The hydroxylated side-chain is constructed stereoselectively using a chiral Wittig reagent. The A-ring synthon is introduced utilising the Wittig-Horner method as developed by Lythgoe et al. The preparation of the metabolite is carried out in 18 steps.
A convergent approach to the dihydrotachysterol diene system. Application to the synthesis of dihydrotachysterol2 (DHT2), 25-hydroxydihydrotachysterol2 (25-OH-DHT2), 10(R),19-dihydro-(5E)-3-epivitamin D2 and 25-hydroxy-10(R),19-dihydro-(5E)-3-epivitamin D2
作者:Miguel A. Maestro、Luis Castedo、Antonio Mourino
DOI:10.1021/jo00045a038
日期:1992.9
Total synthesis of A-ring fragments of 10(S),19-dihydrovitamins D and 10(R),19-dihydro-(5E)-epivitamins D from (+)-(S)-carvone and (-)-(R)-carvone is described. These fragments were used for convergent synthesis of dihydrotachysterol2 (DHT2), 25-hydroxydihydrotachysterol2, 10(R),19-dihydro-(5E)-3-epivitamin D2, and 25-hydroxy-10(R),19-dihydro-(5E)-3-epivitamin D2.