Copper(I)-Promoted Synthesis of Chloromethyl Ketones from Trichloromethyl Carbinols
作者:Ram N. Ram、T. P. Manoj
DOI:10.1021/jo8007644
日期:2008.7.1
Reaction of several trichloromethyl carbinols with 2 equiv of CuCl/bpy in refluxing DCE for 3 h afforded chloromethyl ketones in excellent yield by 1,2-H shift in the copper-chlorocarbenoid intermediate.
β-(Carbonatoxy)alkyl radicals: a new subset of β-(ester)alkyl radical fragmentation during copper(I)-mediated synthesis of 1,1-dichloro-1-alkenes
作者:Ram N. Ram、Ram K. Tittal
DOI:10.1016/j.tetlet.2014.05.097
日期:2014.7
A new subset of β-(ester)alkyl radicals is presented. It is the first study on the chemistry of β-(alkoxycarbonyloxy)alkyl radicals that fill the gap in the spectrum of the migrating groups in β-(ester)alkyl radical reactions. The change from less nucleofugal (acetate) group to the more nucleofugal (carbonate) group in the spectrum of the migrating group changed the reaction path from rearrangement
One-Pot Synthesis of Trichloromethyl Carbinols from Primary Alcohols
作者:Manoj K. Gupta、Zhexi Li、Timothy S. Snowden
DOI:10.1021/jo300725v
日期:2012.5.18
Versatile trichloromethyl carbinols can be prepared in one pot fromprimaryalcohols by treatment with Dess–Martin periodinane (DMP) in CHCl3 followed by introduction of commercially available 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD). A modification of the method was used to convert chiral primaryalcohol (R)-(−)-2,2-dimethyl-1,3-dioxolane-4-methanol to the corresponding trichloromethyl carbinol with
General and Practical Conversion of Aldehydes to Homologated Carboxylic Acids
作者:Lauren R. Cafiero、Timothy S. Snowden
DOI:10.1021/ol8016484
日期:2008.9.1
under basic conditions affords homologated carboxylic acids in high yields. This operationally simple procedure provides a practical, efficient alternative to other homologation protocols. The approach is compatible with sensitive aldehydes including enals and enolizable aldehydes. It also offers convenient access to alpha-monodeuterated carboxylic acids.
Synthesis of 2,4-disubstituted 3-chlorofurans and the effect of the chlorine substituent in furan Diels–Alder reactions
作者:Ram N. Ram、Neeraj Kumar
DOI:10.1016/j.tetlet.2007.11.193
日期:2008.1
3-chlorofurans were synthesized in 42–69% overall yields by CuCl/bpy-catalyzed halogen atom transfer radical cyclization of 1-substituted 2,2,2-trichloroethyl allyl ethers to 2-substituted 3,3-dichloro-4-(1-chloroalkyl)tetrahydrofurans followed by base promoted dehydrochlorination. Diels–Alderreactions of 4-substituted 2-(2-furyl)-, 2-styryl-, and 2-crotyl-3-chlorofurans with dimethyl acetylenedicarboxylate