Synthesis of 2-[1-(Alkoxycarbonyl)alkyl]-3-methylbenzothiazolines and 3-Methyl-2-(2-oxoalkyl)benzothiazolines by the Direct Alkylation of Lithium Enolates with 3-Methylbenzothiazolium Salts
enolates derived from esters and ketones could be readily alkylated with 3-methylbenzothiazolium salts to give the novel α-(benzothiazolinyl) esters and ketones, 2-[1-(alkoxycarbonyl)alkyl]3-methylbenzothiazolines and 3-methyl-2-(2-oxoalkyl)benzothiazolines in good yields, respectively.
Influence of enolate geometry on the stereochemistry of Michael additions of ketone enolates to α,β-unsaturated ketones
作者:David A Oare、Clayton H Heathcock
DOI:10.1016/s0040-4039(00)85424-6
日期:1986.1
Preformed lithiumenolates of ketones react with acyclic α,β-unsaturated ketones to give 1,5-diketones in good chemical yields. A strong correlation exists between enolate geometry and product stereochemistry; enolates having the configuration provide anti addition products while enolates usually provide the syn diastereomers.
A Novel Use of the Anions of Fischer-type Carbene Complexes as Alkenyl Metallic Species
作者:Kohei Fuchibe、Nobuharu Iwasawa
DOI:10.1016/s0040-4020(00)00205-2
日期:2000.7
The anions generated by deprotonation of Fischer-typecarbenecomplexes or by 1,4-addition of lithium enolates to α,β-unsaturated complexes are found to act as alkenyl metallicspecies on iodine oxidation. Various α-methoxy-α,β-unsaturated esters are formed by the treatment of such anions with iodine in the presence of methanol and silver trifluoromethanesulfonate. In addition, alkylcerium reagents
Synthesis of α-Methoxy-α,β-unsaturated Esters by Iodine-oxidation of the Anions of Fischer-type Carbene Complexes
作者:Nobuharu Iwasawa、Kohei Fuchibe
DOI:10.1246/cl.1998.1149
日期:1998.11
α-Methoxy vinyl tungsten species, generated by the deprotonation reaction of Fischer-typecarbenecomplexes or by the Michael addition of lithium enolates to α,β-unsaturated carbenecomplexes, were found to give α-methoxy-α,β-unsaturated esters in good yields by iodine-oxidation in the presence of silver triflate.