A photochemical ring expansion of 6- to 8-membered nitrogen heterocycles by [1,3]-sigmatropic rearrangement
作者:Morgan A. Manning、Wei Sun、Mark E. Light、David C. Harrowven
DOI:10.1039/d1cc00393c
日期:——
route to azocines and benzoazocines from furopyridinones is described through a photochemically induced [1,3]-sigmatropic rearrangement. The method gives access to these 8-membered nitrogen heterocycles from dimethyl squarate in four stages and with excellent atom economy by sequencing thermal and photochemicalringexpansion steps under continuous flow.
A Thermally Induced Hydride Transfer from an Amine to an Allene Triggers an Annulation Reaction, Giving Dihydrofuropyridinones
作者:Wei Sun、Dharyl C. Wilson、Mark E. Light、David C. Harrowven
DOI:10.1021/acs.orglett.8b01792
日期:2018.7.20
A thermal rearrangement leading to dihydrofuropyridinones and related polycyclic ring systems from furanones and cyclobutenones is described. A key feature of the reaction is the thermallyinduced hydride transfer from a 3°-amine to a conjugated allene to trigger cyclization.
One-Step Synthesis of Substituted α-Pyrones from Cyclobutenediones and Lithiated <i>O</i>-Silyl Cyanohydrins
作者:Pamela Mingo、Shijie Zhang、Lanny S. Liebeskind
DOI:10.1021/jo982271m
日期:1999.3.1
<i>tert</i>-Butyl Substituent as a Regiodirecting and Novel C−H Protecting Group in Cyclobutenedione-Based Benzannulation Chemistry
作者:Fuqiang Liu、Lanny S. Liebeskind
DOI:10.1021/jo971565p
日期:1998.5.1
2-Unsubstituted hydroquinone monoacetates, quinones, and 3-unsubstituted quinolizinones were synthesized in moderate to high yields via tert-butyl and trimethylsilyl substituted cyclobutenediones. The addition of unsaturated carbon nucleophiles proceeded regiospecifically at the carbonyl group most distant from the tert-butyl or trimethylsilyl substituent. Thermolysis of the adducts, followed by treatment under acidic conditions to remove the tert-butyl and trimethylsilyl groups in good overall yields, provided access to a variety of "less-substituted" hydroquinone monoacetates, quinones, and quinolizinones. Of the two systems, the tert-butyl-substituted cyclobutenediones proved the most useful.
REED, MICHAEL W.;POLLART, DANIEL J.;PERRI, STEVEN T.;FOLAND, LAFAYETTE D.+, J. ORG. CHEM., 53,(1988) N 11, C. 2477-2482
作者:REED, MICHAEL W.、POLLART, DANIEL J.、PERRI, STEVEN T.、FOLAND, LAFAYETTE D.+