diastereomeric amides (4A,B–6A,B) of (1S,3R)-camphanic acid (lactone of 1-hydroxy-2,2,3-trimethylcyclopentan-1,3-dicarboxylic acid, (−)-camphanic acid 9) with α-arylethylamines 1–3 are deduced from 1H NMRdata and MM2 calculations. The α-arylethyl group in diastereomers A and B adopt nearly opposite absolute conformations, stabilized by hydrogen bonding in the syn-oriented O–C(1)–C(6)–N–H unit, and repulsive
Stereoselective Alkylations of Chiral Nitro Imine and Nitro Hydrazone Dianions. Synthesis of Enantiomerically Enriched 3-Substituted 1-Nitrocyclohexenes
作者:Scott E. Denmark*、Jeffrey J. Ares
DOI:10.1021/jo801790r
日期:2008.12.19
Dianions of chiral nitro imines (generated by a combination of LDA and s-BuLi) underwent diastereoselective alkylation with methyl, butyl, isopropyl, allyl, and methallyl iodides. In contrast to the behavior of simple metalloenamines, the most selective auxiliary contained no coordinating groups but did possess a large steric difference between the two substituents. The yield and selectivity of the
EFFICIENT RESOLUTION OF (±)-1-(9-ANTHRYL)ETHYLAMINE
作者:Marin Roje、Zdenko Hameršak、Vitomir Šunjić
DOI:10.1081/scc-120014769
日期:2002.1
for efficient resolution of (±)-1-(9-anthryl)ethylamine ((±)-1) by fractional crystallization of its salts with (S)-(+)-mandelic acid (2) are reported. When crystallization was performed by fast addition of chloroform solution of an equivalent of (±)-1 to the hot chloroform solution of (+)-2, crystals of mandelate of (+)-1-(9-anthryl)ethylamine ((R,S)-3) are collected in 56% yield. (R)-(+)-1 (98.6% e
Benzylamine derivatives, process for production thereof, and use thereof
申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0221781A2
公开(公告)日:1987-05-13
Benzylamine derivative of the following general formula (I)
wherein R₁ represents an alkyl group, R₂ represents a group of the formula
in which R₄ represents a hydrogen atom, a lower alkyl group or a halogen atom, and
R₃ represents an alkyl or alkenyl group, can be produced by reacting a compound represented by the general formula (III)
R₂-NH-R₃ (III)
wherein R₂ and R₃ are as defined above, with a compound represented by the general formula (IV)
wherein R₁ is as defined and X represents a reactive residue,
or reacting a compound represented by the general formula (V)
wherein R₁ and R₃ are as defined, with a compound represented by the general formula (VI)
X-R₂ (VI)
wherein X and R₂ are as defined, or reacting a compound represented by the general formula (VII)
wherein R₁ and R₂ are as defined above, with a compound represented by the general formula (VIII)
X-R₃ (VIII)
wherein R₃ and X are as defined above. These compounds are useful for the treatment of animal epidemics or infectious diseases induced by fungi as an antimycotic agent for humans and animals, for the control of plant diseases as an agricultural fungicide, and for the control of fungi and bacteria in industrial materials or products as an industrial fungicide.