Abstract A new efficient and selectiveesterification reaction of carboxylic acids with chloroformates is described using silica-supported catalyst (PBGSiCl). The chemioselectivity of the reaction was high particularly for sterically hindered carboxylic acids supported by a single pathway reaction.
Facile synthesis of racemic 2-hexyl-3-Hydroxy-4-pentanolide(NFX-2) and its optical resolution
作者:Takuo Nishida、Takuya Nihira、Yasuhiro Yamada
DOI:10.1016/s0040-4020(01)82315-2
日期:1991.8
A facile stereoselective synthesis of a constituent of antimycin A1 and also the new virginiamycin inducing factor, NFX-2((−)-1) has been achieved. (2RS,3RS,4SR)-2-Hexyl-3-hydroxy-4-pentanolide((±)-1) was obtained by stereoselective intramolecular aldol condensation of 2-(2-bromooctanoyloxy)-1-propanal(7) as the key reaction. (±)-1 was kinetically resolved by asymmetric esterification with a lipase