Novel Convenient Method for the Synthesis of N,N-Bis(trimethylsilyloxy)enamines
作者:A. D. Dilman、A. A. Tishkov、I. M. Lyapkalo、S. L. Ioffe、Yu. A. Strelenko、V. A. Tartakovsky
DOI:10.1055/s-1998-2019
日期:1998.2
Both primary and secondary aliphatic nitro compounds 1 were found to react with two equivalents of bromotrimethylsilane in the presence of triethylamine followed by aqueous workup to give appropriate N,N-bis(trimethylsilyloxy)enamines 3 in good isolated yields. Products 3, starting from some secondary and/or sterically hindered compounds 1, are synthesized from the corresponding silyl nitronates 2.
catalytic asymmetric Henry reaction has been developed with use of a sulfonyldiamine−CuCl complex as a catalyst. A series of new binaphthyl-containing sulfonyldiamine ligands (2a−h) were readily synthesized in two steps starting from commercially available chiral 1,2-diamines. The (R,R)-diamine-(R)-binaphthyl ligand (2d)−CuCl complex smoothly catalyzed the enantioselective Henry reaction with the assistance
Concise Synthesis of Tetrahydropyrans by a Tandem Oxa-Michael/Tsuji-Trost Reaction
作者:Liang Wang、Pengfei Li、Dirk Menche
DOI:10.1002/anie.201003304
日期:2010.11.22
A novel domino sequence facilitates the rapid assembly of polysubstituted tetrahydropyrans. The one‐pot relay process generates up to three new stereogenic centers, including a tetrasubstituted carbon center, in a highly concise and convergent fashion from simple starting materials.
作者:Uday V. Desai、D. M. Pore、R. B. Mane、S. B. Solabannavar、P. P. Wadgaonkar
DOI:10.1081/scc-120027233
日期:2004.12.31
Abstract Potassium phosphate was found to catalyze condensation of nitroalkanes with various aliphatic and aromatic aldehydes to form nitroaldols in excellent yields in acetonitrile medium at room temperature.
diastereoselective Henry reaction of various aldehydes with nitroethane was developed using the guanidine-thioureabifunctional catalyst 1 (syn selectivity of 86:14 to 99:1 with 84–99 % ee). A variety of nitroalkanes was treated with unbranched and branched aldehydes and gave nitro alcohols with high syn diastereoselectivities (90:10 to 99:1) and high enantioselectivities (85–95 % ee). This reaction was successfully