Rhodium carbenoid mediated cyclisations. Use of ethyl lithiodiazoacetate in the preparation of ω-hydroxy-,-mercapto-, and -boc-amino-α-diazo-β-keto esters
作者:Christopher J. Moody、Roger J. Taylor
DOI:10.1016/s0040-4039(00)96727-3
日期:1987.1
Reaction of ethyl lithiodiazoacetate with lactones, thiolactones, and lactams (1, 4, 8) gives the diazo-compounds (2, 5, 9), substrates for rhodiumcarbenoidcyclisation reactions.
Rhodium carbenoid mediated cyclisations. Part 5. Synthesis and rearrangement of cyclic sulphonium ylides preparation of 6- and 7-membered sulphur heterocycles
作者:Christopher J. Moody、Roger J. Taylor
DOI:10.1016/s0040-4020(01)96017-x
日期:1990.1
Treatment of diazo mercaptans with rhodium(ll) acetate gives six- and seven-membered sulphur heterocycles; diazo sulphides give cyclic sulphoniumylides, which are isolable, or rearrange, depending on the nature of the substituent on sulphur.
Carbonylative Suzuki–Miyaura Coupling Reaction of Lactam-, Lactone-, and Thiolactone-Derived Enol Triflates for the Synthesis of Unsymmetrical Dienones
作者:Laura Bartali、Antonio Guarna、Paolo Larini、Ernesto G. Occhiato
DOI:10.1002/ejoc.200601089
日期:2007.5
carbonylative Suzuki–Miyaura cross-coupling reaction of enoltriflates with alkenylboronic acids for the synthesis of unsymmetrical dienones is reported. Conditions were found that enabled the coupling of structurally different enoltriflates derived from lactams, lactones, and thiolactones (i.e., cyclic ketene aminal, acetal, and thioacetal triflates, respectively) with various alkenylboronic acids at
A new class of conjugated strigolactone analogues with fluorescent properties: synthesis and biological activity
作者:Chaitali Bhattacharya、Paola Bonfante、Annamaria Deagostino、Yoram Kapulnik、Paolo Larini、Ernesto G. Occhiato、Cristina Prandi、Paolo Venturello
DOI:10.1039/b907026e
日期:——
A new class of strigolactoneanalogues has been synthesized. They differ from known molecules, both of natural and synthetic origin, in two main features. The conjugated system extends from the enol ether bridge to the A ring, the B ring is a heterocycle while the C ring is a cyclic ketone instead of a γ-lactone. The key step of the synthesis is a Nazarov cyclization on activated substrates. Bioassays
products of carbonylative coupling between lactam-, lactone- and thiolactone-derived vinyl triflates and alkenylboronic acids are suitable substrates for the Lewisacidcatalyzed Nazarov reaction. The most efficient Lewisacids for the Nazarov reaction are scandium(III) and indium(III) triflates (3-15 mol%) in 1,2-dichloroethane, which provide the Nazarov products in moderate to excellent yield (53-86%)