Synthesis of (3R,4R,5R)-1-(tert-Butoxycarbonyl)-3,4-isopropylidenedioxy-5-methoxymethyl-2-pyrrolidinone from (S)-Pyroglutaminol.
作者:Nobuo IKOTA
DOI:10.1248/cpb.40.1925
日期:——
(3R, 4R, 5R)-1-(tert-Butoxycarbonyl)-3, 4-isopropylidenedioxy-5-methoxymethyl-2-pyrrolidinone (6), a useful chiral intermediate for the preparation of calyculins, was synthesized starting from (S)-pyroglutaminol via the O-methylation of 1c with diazomethane in the presence of fluoboric acid and cis-dihydroxylation of the α, β-unsaturated lactam (4) as the key reactions.
(3R,4R,5R)-1-(叔丁氧羰基)-3,4-异亚丙基二氧-5-甲氧基甲基-2-吡咯烷酮 (6)是一种用于制备钙苷的有用手性中间体、是以(S)-焦谷氨醇为起点,在氟硼酸存在下通过重氮甲烷对 1c 进行 O-甲基化反应,并以α,β-不饱和内酰胺 (4) 的顺式二羟基化反应为关键反应合成的。