Allenyl ester precursors for 1H-inden-1-ol carboxylates: comparisons with their propargylic equivalents having terminal alkyne functions
作者:Martta Asikainen、Simon Woodward
DOI:10.1016/j.tet.2012.04.086
日期:2012.7
and their isomeric equivalents the terminal propargylic carboxylates, ArC(R1)(O2CR2)CCH, in gold-catalyzed carbocyclization to indenes provides information on 1,3 and 1,2-carboxylate shifts associated with their interconversion. Allenyl carboxylates transform specifically to 1H-inden-1-yl carboxylates in high yields, under AuI-catalysis. Their equivalent propargylic carboxylates give complex mixtures
在金催化的碳环化反应中烯丙基羧酸盐Ar(R 1)CCCH(O 2 CR 2)的反应性及其端基炔丙基羧酸盐ArC(R 1)(O 2 CR 2)CCH的异构体等价物提供了有关与它们的相互转化有关的1,3和1,2-羧酸盐移位。在Au I-催化下,烯丙基羧酸盐可高产率地特异性转化为1 H-茚-1-基羧酸盐。它们的当量炔丙基羧酸盐提供了茚异构体和消除产物的复杂混合物。机理测试表明,在这种情况下,末端炔丙基碳酸酯向其丙二烯的互变至多缓慢。