Titanocene(III) chloride mediated radical induced addition-elimination route to the synthesis of racemic and optically active trisubstituted tetrahydrofurans: Formal synthesis of magnofargesin and 7′-epimagnofargesin
作者:P CHAKRABORTY、S K MANDAL、S C ROY
DOI:10.1007/s12039-016-1106-0
日期:2016.7
Titanocene(III) Chloride mediated radical induced synthesis of 4-benzylidene substituted tetrahydrofuran, a typical lignan skeleton, has been accomplished in good yield through addition-elimination route in racemic as well as in optically active forms. The method has been applied to the synthesis of furano lignans, magnofargesin (1) and 7′-epimagnofargesin (2) in optically active forms. Titanocene(III)
An efficient enantioselective formaltotalsynthesis of antimalarial natural product (-)-raphidecursinolB along with its all stereoisomers is described from commercially available 3,4,5-trimethoxybenzaldehyde using the Sharpless asymmetric dihydroxylation, regioselective α-tosylation, epoxide opening and Mitsunobu reaction as the key reaction steps.
使用 Sharpless 不对称二羟基化、区域选择性 α-甲苯磺酰化、环氧化物开环和 Mitsunobu 反应,从市售的 3,4,5-三甲氧基苯甲醛中描述了抗疟天然产物 (-)-raphidecursinol B 及其所有立体异构体的有效对映选择性形式全合成关键反应步骤。