2,3-二甲基-1,3-丁二烯 、 富马酸二甲酯 在
乙醚 作用下,
以
甲苯 为溶剂,
反应 24.0h,
以to give the title compound in 85%的产率得到dimethyl (4R,5R)-1,2-dimethylcyclohexene-4,5-dicarboxylate
Enantioselective Diels-Alder Reactions of Carboxylic Ester Dienophiles Catalysed by Titanium-Based Chiral Lewis Acid
作者:Yogesh Choughule、Anand Patwardhan
DOI:10.13005/ojc/320217
日期:2016.4.28
A new titanium-based chiralLewisacid 1 has been developed using (1R,2R)-1,2-bis-(2methoxyphenyl)-ethane-1,2-diol as a chiral vicinal diol ligand. This chiral catalyst was found to exhibit uniformly high enantioselectivity towards carboxylic ester dienophiles in Diels-Alder reactions. The chiral vicinal ligand (1R,2R)-1,2-bis-(2-methoxyphenyl)-ethane-1,2-diol is inexpensive and is easily accessible
Asymmetric Diels-Alder reactions of carboxylic ester dienophiles promoted by chiral Lewis acids
作者:Paul N. Devine、Taeboem Oh
DOI:10.1021/jo00027a074
日期:1992.1
Alicyclic diamine fungicides
申请人:British Technology Group Limited
公开号:US05464873A1
公开(公告)日:1995-11-07
Use of a compound having the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 which may be the same or different represent hydrogen atoms or alkyl groups of 1-6 carbon atoms, or NR.sup.1 R.sup.2 and/or NR.sup.3 R.sup.4 together represent a heterocyclic group having 5 or 6 ring atoms, x is 0 or 1 and when x is 0, the dashed line represents a double bond, N represents a saturated or ethylenically unsaturated divalent hydrocarbyl group required to complete a cycloalkane, cycloalkene or cycloalkadiene ring of 3 to 6 ring atoms and from 0 to 2 double bonds, in the form of the free base or an acid addition salt tolerable to plants, as a plant fungicide, as a fungicide, especially as a mildewicide. Some of the compounds of formula (1) are new and are claimed per se.