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Highly Enantioselective Organocatalytic Addition of Aldehydes to N-(Phenylmethylene)benzamides: Asymmetric Synthesis of the Paclitaxel Side Chain and Its Analogues

机译:醛对N-(苯基亚甲基)苯甲酰胺的高度对映选择性有机催化加成反应:紫杉醇侧链的不对称合成及其类似物

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摘要

A simple highly enantioselective organocatalytic addition of aldehydes to N-(phenylmethylene)benzamides is presented. The application of (R)-proline as the catalyst and subsequent oxidation of the protected alpha-hydroxy-beta-benzoylaminoaldehydes (92%-99% ee) gives access to esterification-ready phenylisoserine derivatives such as the protected paclitaxel (taxol) side chain. Esterification of these derivatives with baccatin III gives access to the cancer chemotherapeutic substance paclitaxel and its analogues that do not exist in nature.
机译:提出了向N-(苯基亚甲基)苯甲酰胺的醛的简单高对映选择性有机催化加成。 (R)脯氨酸作为催化剂的应用以及随后对受保护的α-羟基-β-苯甲酰氨基醛(92%-99%ee)的氧化可得到易于酯化的苯基异丝氨酸衍生物,例如受保护的紫杉醇(紫杉醇)侧链。用浆果赤霉素III酯化这些衍生物使人们获得了自然界中不存在的癌症化疗物质紫杉醇及其类似物。

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