Asymmetric synthesis of palitantin from the (5R)-tert-butyldimethylsiloxy-2-cyclohexenone
作者:Georges Hareau、Masakazu Koiwa、Takeshi Hanazawa、Fumie Sato
DOI:10.1016/s0040-4039(99)01549-x
日期:1999.10
(+)-Palitantin (2) has been synthesized in 25% overall yield from the (5R)-tert-butyldimethylsiloxy-2-cyclohexenone [(R)-1] where a remarkable diastereoselective cat. OsO4cis-dihydroxylation of (R)-1 furnished the precursor of the optically pure (5R,6R)-bis-trimethylsiloxy 2-cyclohexenone (7) which underwent highly selectively the 1,4-addition reaction of the 1,3-heptadienyl cyanocuprate to give, after
从(5 R)-叔丁基二甲基甲硅烷氧基-2-环己烯酮[(R)-1 ]合成了(+)-青霉素(2),其总收率为25%,这是一种非对映选择性猫。(R)-1的OsO 4顺式-二羟基化反应提供了光学纯的(5 R,6 R)-双-三甲基甲硅烷氧基2-环己烯酮(7)的前体,该化合物高度选择性地进行了1,的1,4-加成反应3-庚二烯基氰基戊酸酯在用甲醛捕集相应的烯醇铜后,得到目标化合物。