In our strategy for the total synthesis of tylonolide 2, aglycon of tylosin 1, and for the construction of the eastern part C1-C9, we planned to carry out a Hoppe homoaldolisation. In a model study, reaction was performed between racemic titanated crotyl carbamate (±)-3b and optically active aldehydes 6a-c. The expected syn-anti adducts 7a-c were obtained in good isolated yield together with the anti-anti isomer 8a-c. Interestingly, the γ-lactol 6d was also tested and delivered the syn-anti 7d compound in 70% isolated yield.
LARCHEVEQUE, MARC;HENROT, SERGE, TETRAHEDRON, 43,(1987) N 10, 2303-2310
作者:LARCHEVEQUE, MARC、HENROT, SERGE
DOI:——
日期:——
A stereospecific synthesis of optically pure (-)-α-multistriatin
作者:Marc Larcheveque、Serge Henrot
DOI:10.1016/s0040-4020(01)86814-9
日期:——
An efficient stereo- and enantiospecific synthesis of (-) -α-multistriatin from (L)- malic acid is described. The key steps of this synthesis are the stereoselective alkylation of the hydroxylactone 5 and the acid equilibration of the esters 9 and 10.