Regioselective synthesis of 4-chlorophenols, 10-chloro-7-hydroxy-6H-benzo[c]chromen-6-ones, and 4-chloro-1-hydroxy-9H-fluoren-9-ones based on [3+3] cyclizations of 1,3-bis(silyloxy)-1,3-dienes with 2-chloro-3-silyloxy-2-en-1-ones
摘要:
A variety of 4-chlorophenols, 10-chloro-7-hydroxy-6H-benzo[c]chromen-6-ones, and 4-chloro-1-hydroxy-9H-fluoren-9-ones were prepared by formal [3+3] cyclizations of 1,3-bis(silyloxy)-1,3-dienes with 2-chloro-3-(silyloxy)alk-2-en-1-ones. (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis and spectral studies of (1,3-diketonato)triphenylantimony(V) complexes
作者:V.K. Jain、R. Bohra、R.C. Mehrotra
DOI:10.1016/s0022-328x(00)94363-8
日期:1980.1
Ph3SbBr2 reacts with Na[RCOCHCOR′] to form compounds of the type Ph3SbBr(RCOCHCOR′) (where R = R′ = CH3, C(CH3)3 and R ɳ R′ = CH3, C6H5; CH3, 4′-MeC6H4; CH3, 4′-MeOC6H4; CH3, 4′-ClC6H4; CH3, 4′BrC6H4 and CF3, 2-C4H3S). Reactions of Ph3Sb(OMe)2 with RCOCH2COR′ yield Ph3Sb(OMe) (RCOCHCOR′). From molecular weight, IR and NMR data, it is concluded that 1,3-diketone ligand moiety behaves as a bidentate
A Synthetic Study of Chiral α-Hydroxy-<i>H</i>-Phosphinates Based on Proline Catalysis
作者:Qiuli Yao、Chengye Yuan
DOI:10.1002/chem.201204195
日期:2013.5.3
A highly enantioselective synthesis of α‐hydroxyphosphinates was achieved based on the L‐proline‐catalyzed aldol reaction of α‐acylphosphinates and acetone. Due to the preexisting chirality at the phosphorus center, mixtures of two diastereomers of the α‐hydroxyphosphinates were obtained in moderate to good yields, with simultaneously high enantioselectivity for both diastereomers. The products could
Base-induced intramolecularcyclization of novel (4-aryl-2,4-dioxobutyl)methylphenylsulfonium salts prepared from the commercially available 1-arylethanone by a cost-effective process is described in this paper. The reaction was completed within 10 min to produce a family of 2-unsubstituted 5-aryl-3(2H)-furanones in excellent yield. This procedure is simple, and can be carried out under mild conditions
Regioselective synthesis of 4-chlorophenols, 10-chloro-7-hydroxy-6H-benzo[c]chromen-6-ones, and 4-chloro-1-hydroxy-9H-fluoren-9-ones based on [3+3] cyclizations of 1,3-bis(silyloxy)-1,3-dienes with 2-chloro-3-silyloxy-2-en-1-ones
A variety of 4-chlorophenols, 10-chloro-7-hydroxy-6H-benzo[c]chromen-6-ones, and 4-chloro-1-hydroxy-9H-fluoren-9-ones were prepared by formal [3+3] cyclizations of 1,3-bis(silyloxy)-1,3-dienes with 2-chloro-3-(silyloxy)alk-2-en-1-ones. (c) 2007 Elsevier Ltd. All rights reserved.