The present invention provides unified synthesis of the C1-C19 building blocks of halichondrins and analogs thereof using selective coupling of poly-halogenated nucleophiles in chromium-mediated coupling reactions. The present invention also provides a practical and efficient synthesis of C20-C38 building blocks of halichondrins and analogs thereof. Also provided herein are general methods of selective activation and coupling of poly-halogenated analogs with an aldehyde. The provided coupling reactions are selective for halo-enone and halo-acetylenic ketal over vinyl halide and halide attached to a sp hybridized carbon. The provided efficient selective coupling reactions can allow easy access to the C1-C19 building blocks and C20-C38 building blocks of halichondrins and analogs thereof with limited or no purification or separation of the intermediates.
本发明在
铬介导的偶联反应中,利用多卤代亲核物的选择性偶联,提供了卤代
姜黄素及其类似物的 C1-C19 结构单元的统一合成。本发明还提供了一种实用高效的哈里
琼脂及其类似物的 C20-C38 结构单元的合成方法。本发明还提供了选择性活化多卤代类似物并将其与醛偶联的一般方法。所提供的偶联反应对卤代烯酮和卤代
乙炔缩酮具有选择性,而对
乙烯基卤化物和连接到 sp 杂化碳上的卤化物则没有选择性。所提供的高效选择性偶联反应可以方便地获得卤代烯酮及其类似物的 C1-C19 构建砌块和 C20-C38 构建砌块,中间产物的纯化或分离程度有限,甚至不需要纯化或分离。