Stereospecific<i>C</i>=β-Glycosidation and Synthesis of 4,7-Anhydro-5,6-isopropylidene-4 (<i>S</i>), 5(<i>S</i>), 6(<i>R</i>), 7(<i>R</i>)-Tetrahydroxyoxocan-2-one
作者:Sukhendu B. Mandal、Basudeb Achari
DOI:10.1080/00397919308011209
日期:1993.5
(2) with methoxycarbonyl-methylene triphenylphosphorane was accompanied by spontaneous cyclization to generate 3 stereospecifically. Deprotection of 5-OH followed by mild base hydrolysis and cyclization with Py-Ac2O-DBU then yielded 4,7-anhydro-5,6-isopropylidene-4(S), 5(S), 6(R), 7(R)-tetrahydroxyoxocan-2-one (5) in good overall yield.
摘要 2,3-O-异亚丙基-5-O-panisyldiphenylmethyl-β-D-呋喃核糖(2)与甲氧基羰基-亚甲基三苯基膦的Wittig反应伴随自发环化生成3立体特异性。5-OH 脱保护,然后用 Py-Ac2O-DBU 进行温和碱水解和环化,然后产生 4,7-脱水-5,6-异亚丙基-4(S), 5(S), 6(R), 7(R) )-tetrahydroxyoxocan-2-one (5) 的总产率良好。