Vicinal Tricarbonyl products from singlet oxygen reactions.
作者:Harry H. Wasserman、William T. Han
DOI:10.1016/0040-4039(84)80120-3
日期:1984.1
Vicinaltricarbonyl systems are readily formed by reacting β-dicarbonyl precursors with DMF acetal to form enamines which are then cleaved by photooxidation. This procedure may be applied to the formation of carbacephams.
C–C Bond Formation via Copper-Catalyzed Conjugate Addition Reactions to Enones in Water at Room Temperature
作者:Bruce H. Lipshutz、Shenlin Huang、Wendy Wen Yi Leong、Guofu Zhong、Nicholas A. Isley
DOI:10.1021/ja309409e
日期:2012.12.12
Conjugate addition reactions to enones can now be done in water at roomtemperature with in situ generated organocopper reagents. Mixing an enone, zinc powder, TMEDA, and an alkyl halide in a micellar environemnt containing catalytic amounts of Cu(I), Ag(I), and Au(III) leads to 1,4-adducts in good isolated yields: no organometallic precursor need be formed.
作者:L.D. Cama、Kenneth J. Wildonger、Ravindranath Guthikonda、R.W. Ratcliffe、B.G. Christensen
DOI:10.1016/s0040-4020(01)92147-7
日期:1983.1
The total syntheses of 2-aryl and 2-heteroaryl carbapen-2-em-3-carboxylic acids with and without a 6-hydroxyethyl side chain, using a Wittig cyclization for formation of the bicyclic ring system is described. Antibacterial activity of the compounds synthesized is discussed.
Process for the preparation of 1-carbapenems and intermediates via
申请人:Merck & Co., Inc.
公开号:US04309346A1
公开(公告)日:1982-01-05
Disclosed is a process for the total synthesis of 1-carbapenem antibiotics (I) from L-aspartic acid via intermediates II and III: ##STR1## wherein R is hydrogen, a pharmaceutically acceptable ester moiety or salt cation, or a readily removable blocking group; R.sup.6 and R.sup.7 are, inter alia, independently selected from the group consisting of hydrogen, alkyl, alkenyl, aryl and aralkyl; R.sup.1' is hydrogen or a protecting group; and R.sup.a, R.sup.b and R.sup.c are independently selected from alkyl, aryl and aralkyl.