Regioselective monoalkylations of the vicinal cis-diol group in mannopyranosides using diaryldiazoalkanes-tin(II) chloride
作者:Sigthor Petursson、John M. Webber
DOI:10.1016/s0008-6215(82)80006-2
日期:1982.5
Abstract Highly regioselective monoalkylations of the cis -2,3-diol group in mannopyranosides can be achieved with diaryldiazoalkanes in the presence of catalytic amounts of tin(II) chloride. With diazo(diphenyl)methane ( 1 ), its 4,4′-dimethyl ( 2 ) and 4,4′-dichloro ( 3 ) derivatives, and 9-diazofluorene ( 5 ), methyl 4,6- O -benzylidene- α - d -mannopyranoside gave high yields of the respective
1,3-Dipolar cycloaddition of diaryldiazomethanes across N-ethoxy-carbonyl-N-(2,2,2-trichloroethylidene)amine and reactivity of the resulting 2-azabutadienes towards thiolates and cyclic amides
作者:Rodolphe Kinghat、Gérard Schmitt、Kabula Ciamala、Abderrahim Khatyr、Michael Knorr、Sandrine Jacquot-Rousseau、Yoann Rousselin、Marek M. Kubicki
DOI:10.1016/j.crci.2015.09.017
日期:2016.3
dithioethers [Ar2C N–C(StBu) C(H)(StBu)] (7a Ar = C6H5; 7b Ar' = p-ClC6H4). The reaction of 4a with NaSEt conducted in neat EtSH produces [Ph2C N–C(H)(SEt)–CCl2H] 8, which after dehydrochloration by NaOMe and subsequent addition of NaSEt is converted to [Ph2C N–C(SEt) C(H)(SEt)] 7c. Upon the reaction of 4c with NaSiPr, the intermediate dithioether [(p-ClC6H4)2C N–CH C(SiPr)2] 5k is converted to tetrakisthioether