2,5-Cyclohexadien-1-one to bicyclo[3.1.0]hexenone photorearrangement. Development of the reaction for use in organic synthesis
作者:Arthur G. Schultz、Frank P. Lavieri、Mark Macielag、Mark Plummer
DOI:10.1021/ja00247a027
日期:1987.6
Le mecanisme le plus plausible fait intervenir un zwitterion de preference a un biradical organique
Le mecanisme le plus plausible fait intervenir un zwitterion de preferred a un biradicalorganique
SCHULTZ A. G.; LAVIERI F. P.; MACIELAG M., TETRAHEDRON LETT., 27,(1986) N 13, 1481-1484
作者:SCHULTZ A. G.、 LAVIERI F. P.、 MACIELAG M.
DOI:——
日期:——
SCHULTZ, A. G.;LAVIERI, F. P.;MACIELAG, M.;PLUMMER, M., J. AMER. CHEM. SOC., 109,(1987) N 13, 3991-4000
作者:SCHULTZ, A. G.、LAVIERI, F. P.、MACIELAG, M.、PLUMMER, M.
DOI:——
日期:——
Substituent effects on the photorearrangements of 4-alkoxy-4-carbomethoxy-3-methoxy-2,5-cyclohexadien-1-ones
作者:Arthur G. Schultz、Roger E. Harrington
DOI:10.1021/jo00022a033
日期:1991.10
Enantiomerically enriched 4-carbomethoxy-3,4-dimethoxy-2,5-cyclohexadien-1-one (1) undergoes a completely diastereoselective (but not enantiospecific) type A photorearrangement at 366 nm to give 6-carbomethoxy-4,6-dimethoxybicyclo[3.1.0(1,5)]hex-3-en-2-one (2) in 81% isolated yield. A chiral NMR shift study indicates that 1 undergoes partial loss of absolute configuration at C(4) during irradiation. Bicyclohexenone 2 is photostable at 366 nm but rearranges to its diastereoisomer 3 and phenols 4 and 5 at > 300 nm. It is proposed that ground-state conformational effects control the type A photoreactivity of 1 and that rearrangement to 2 occurs in accord with the principle of least motion in the transition states for rearrangements to diastereomerically related zwitterions 1a and 1b (Scheme III). The intramolecular 2 + 2 photocycloaddition of 4-carbomethoxy-3-methoxy-4-(1'-oxa-3'-butenyl)-2,5-cyclohexadien-1-one (9) gives a mixture of 7-oxatricyclodecenones 10 (58%) and 11 (18%), without interference from type A photoreactivity.
The regioselectivity and stereoselectivity of the photorearrangement of 3-methoxy-4- methoxycarbonyl-4-methyl-2,5-cyclohexadien-1-one
作者:Arthur G. Schultz、Frank P. Lavieri、Mark Macielag