Multicomponent Mannich Reactions with Boron Enolates Derived from Diazo Esters and 9-BBN
作者:Yi Luan、Scott E. Schaus
DOI:10.1021/ol200766t
日期:2011.5.6
3-component Mannich condensation reaction. Catalyzed by Cu(II) salts, the reaction affords the corresponding isocyanate Mannich product: one that can be easily trapped in situ by other nucleophiles. The Mannich condensation corresponds to an α,α-disubstituted enolate addition to imines. The reaction was rendered asymmetric by using the (−)-phenylmenthol ester in good yield and selectivities.
Photochemical synthesis of 1,2,4-triazoles <i>via</i> addition reaction of triplet intermediates to diazoalkanes and azomethine ylide intermediates
作者:Bao-Gui Cai、Ye-Peng Bao、Chao Pei、Qian Li、Lei Li、Rene M. Koenigs、Jun Xuan
DOI:10.1039/d2sc04720a
日期:——
addition reaction with diazoalkanes and formation of an azomethine ylide followed by dipolar cycloaddition reaction with organic nitriles to give a 1,2,4-triazole. The application of this transformation was elaborated in a broad and general substrate scope (48 examples), including scale-up via flow chemistry and downstream transformations. Experimental and computationalstudies were performed to elucidate