A Total Synthesis of (+)- and (-)-Dihydrokavain with a Sonochemical Blaise Reaction as the Key Step
作者:Fang-Dao Wang、Jian-Min Yue
DOI:10.1002/ejoc.200400833
日期:2005.6
Starting from 2,3-O-isopropylidene-D-glyceraldehyde (2) as chiral material, the naturally occurring (S)-(+)-dihydrokavain (1a) was synthesized by a procedure that involves a sonochemical Blaise reaction as the key step. The absolute configuration of (S)-(+)-dihydrokavain (1a) is demonstrated for the first time by total synthesis from a chiral source. Its opposite enantiomer, (R)-(–)-dihydrokavain (1b)
以 2,3-O-异亚丙基-D-甘油醛 (2) 作为手性材料,以声化学 Blaise 反应为关键步骤合成天然存在的 (S)-(+)-dihydrokavain (1a) . (S)-(+)-dihydrokavain (1a) 的绝对构型首次通过手性来源的全合成得到证明。其相反的对映异构体 (R)-(-)-dihydrokavain (1b) 也是在 Mitsunobu 反应中手性中心反转后合成的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)