3,6-Thioanhydro sugar derivatives. An enantiospecific synthesis of (2<i>R</i>,3<i>R</i>,4<i>S</i>)-3-benzyloxy-4-hydroxy-2-[(<i>R</i>)-1-benzyloxy-4-hydroxybutyl]thiolane as the key intermediate for thioswainsonine
作者:Isidoro Izquierdo、Maria T. Plaza、Antonio RamYírez、Fida Aragón
DOI:10.1002/jhet.5570330440
日期:1996.7
ethoxycarbonylmethylenetriphenylphosphorane to give an = 1:1 E/Z mixture of the corresponding α,β-unsaturated ester (12). Finally, catalytic hydrogenation of 12 to ethyl (R)-4-benzyloxy-4-[(2′R)3′R,4′S)-3′-benzyloxy-4′-hydroxythiolan-2′-yl]butanoate (13) and subsequent reduction with lithium aluminum hydride gave the title compound 14.
甲基2 - O-苄基-3,6-硫代脱水-α-D-甘露吡喃糖苷(9)是从市售的甲基α-D-吡喃葡萄糖苷中分八步获得的。通过酸水解化合物2,将化合物9转化为(2 R,3 R,4 S)-3-苄氧基-4-羟基-2-[(R)-1-苄氧基-4-羟基丁基]硫烷(14)。 4-二-O-苄基衍生物10,然后将未分离的2,4-二-O-苄基-3,6-硫代脱水-D-甘露糖(11)与乙氧基羰基亚甲基三苯基膦烷反应,得到= 1:1 E / Z相应的α,β-不饱和酯(12)的混合物。最后,催化加氢12到乙基(- [R)-4-苄氧基-4 - [(2' - [R)-3' - [R,4'小号)-3'-苄氧基-4'- hydroxythiolan -2'-基]丁酸乙酯(13),然后用氢化锂铝还原得到标题化合物14。