BRANCACCIO; LARIZZA, Farmaco, Edizione Scientifica, 1964, vol. 19, p. 986 - 1002
作者:BRANCACCIO、LARIZZA
DOI:——
日期:——
Bischoff, Chemische Berichte, 1906, vol. 39, p. 3831
作者:Bischoff
DOI:——
日期:——
BURYAN P.; MACAK J.; WALTER K., COLLECT. CZECH. CHEM. COMMUN., 1978, 43, 2174-2178
作者:BURYAN P.、 MACAK J.、 WALTER K.
DOI:——
日期:——
Enantioselective Synthesis of Quaternary α-Amino Acids via <scp>l</scp>-<i>tert</i>-Leucine-Derived Squaramide-Catalyzed Conjugate Addition of α-Nitrocarboxylates to Enones
作者:Kalisankar Bera、Nishikant S. Satam、Irishi N. N. Namboothiri
DOI:10.1021/acs.joc.6b00543
日期:2016.7.1
Enantioselective Michael addition of tertiary α-nitroesters to β-unsubstituted vinyl ketones has been carried out in the presence of an l-tert-leucine-derived squaramide as organocatalyst. The products, quaternary α-nitroesters, were formed in excellent yield and moderate to good ee’s in most cases. Scale-up of the reaction and synthetic applications of the products, including transformation to representative