从非手性前体开始,从循环到 ls 的合成是有机合成中的当前挑战。大多数合成策略都来自手性前体(例如碳水化合物)1-5 或分解在 Die ls-A lder 反应中形成的外消旋加合物。 6 '7 我们在此报告应用 oir abb it musc le al do lase (RAMA; EC 4 .1 .2 .13) 将 cyc li 制备成 ls 和 Cg lycos ides(方案 1)。RAMA 催化磷酸二羟基丙酮 (DHAP) 和醛的羟醛缩合,并与
5-thio-D-xylopyranose, a synthon used for the preparation of drugs with antithrombotic activity, was synthesised by an enzymatic isomerisation from the corresponding ketose, 5-thio-D-xylulofuranose, with glucose isomerase. This compound was obtained by two different chemoenzymatic routes, the key step being the stereospecific formation of a C–C bond, catalysed by transketolase or fructose-1,6-bisphosphate
Chemo-enzymatic synthesis of natural products: synthesis of sphydrofuran
作者:Balu P. Maliakel、Walther Schmid
DOI:10.1016/s0040-4039(00)92071-9
日期:1992.6
methods as well as via a diastereoselective Grignardreaction. Rabbit muscle aldolase (RAMA)-catalyzed aldol condesation of chloroacetaldehyde 3 with dihydroxyacetone phosphate (DHAP) 4 affords the C-5 skeleton of 5 which was transformed to sphydrofuran 1 and its analogue 10 via a Grignard addition of allylmagnesiumbromide followed by a Wacker reaction.