Towards the total synthesis of calyculin C: preparation of the C9–C25 spiroketal-dipropionate unit
作者:Damien Habrant、Ari M. P. Koskinen
DOI:10.1039/c0ob00092b
日期:——
An asymmetric synthesis of the C9–C25 spiroketal fragment of calyculin C is described. Key steps include two crotylation reactions using successively Brown's reagent and (Z)-crotyltrifluorosilane for the formation of the anti, anti, anti stereotetrad, ynone formation by a Pd-catalyzed coupling of a thiol ester with a terminal alkyne and a double intramolecular hetero-Michael addition for the stereoselective
C 9 -C 25螺酮片段的不对称合成。钙调蛋白C描述。关键步骤包括依次使用布朗氏试剂进行两个crotylation反应和(Z)-巴豆基三氟硅烷为了形成抗,抗,抗立体四烯酮,是通过Pd催化的巯基酯与末端炔烃的偶合和双分子内杂-迈克尔加成反应形成的,用于spiroketal构架的立体选择性。