Intramolecular photocycloaddition reactions of 3-(2-propenoxy)cyclopent-2-en-1-ones and 3-(2-propenoxy)cyclohex-2-en-1-ones
摘要:
The 3-oxa-1,5-hexadienones 4a, 4b, 5a, and 5b undergo intramolecular [2 + 2] photocycloaddition reactions with quantum yields ranging from 0.2 to 0.002. In general, oxa substitution decreases the quantum yields and favors the formation of crossed closure products in comparison to the alkenyl analogs. Irradiation of stereospecifically deuterated dienones 11a and 12a indicate that the intermediate biradical reverts to the starting dienone faster than it proceeds to product. The results are compared with the analogous alkenyl systems. An explanation for changes in regiochemistry, quantum yields, and reversion rates between the two systems is offered.
Intramolecular photocycloaddition reactions of 1-acyl-3-oxa-1,5-hexadienes
作者:Albert R. Matlin、David J. McGarvey
DOI:10.1016/s0040-4039(00)95597-7
日期:——
The regioselectivity of the intramolecular [2+2] photocycloadditions of 1-Acyl-3-oxa-1,5-hexadienes appears, in general, to follow “rule of five” closure and give annelated 2-oxa-bicyclo[2.1.1]hexanes.
MATLIN, ALBERT R.;MCGARVEY, DAVID J., TETRAHEDRON LETT., 28,(1987) N 43, 5087-5090
作者:MATLIN, ALBERT R.、MCGARVEY, DAVID J.
DOI:——
日期:——
Intramolecular photocycloaddition reactions of 3-(2-propenoxy)cyclopent-2-en-1-ones and 3-(2-propenoxy)cyclohex-2-en-1-ones
作者:Albert R. Matlin、Benjamin E. Turk、David J. McGarvey、Alejandro A. Manevich
DOI:10.1021/jo00043a019
日期:1992.8
The 3-oxa-1,5-hexadienones 4a, 4b, 5a, and 5b undergo intramolecular [2 + 2] photocycloaddition reactions with quantum yields ranging from 0.2 to 0.002. In general, oxa substitution decreases the quantum yields and favors the formation of crossed closure products in comparison to the alkenyl analogs. Irradiation of stereospecifically deuterated dienones 11a and 12a indicate that the intermediate biradical reverts to the starting dienone faster than it proceeds to product. The results are compared with the analogous alkenyl systems. An explanation for changes in regiochemistry, quantum yields, and reversion rates between the two systems is offered.