factor-active drugs. The use of the piperidine catalyst and no catalyst showed very high cis-stereoselectivity (cis/trans = 10/1—50/1) during the reaction. On the other hand, the trans-selective reaction was promoted by Ti(O-i-Bu)4 and Al(O-s-Bu)3 catalysts (cis/trans = 1/8—1/25). Both reactions were conducted with higher cis- and trans-selectivities as compared with those of the alkyl 2-mercaptoalkanoates under
Two distinctive methods for the synthesis of cis- and trans-2, 5-disubstituted-thiazolidin-4-ones via stereoselective cyclo-condensation between α-mercaptocarboxylic esters and arylimines have been developed. With the new reaction used as the key step, two sets of optically active anti-PAF active thiazolidin-4-ones were synthesized.
O‐to‐S Substitution Enables Dovetailing Conflicting Cyclizability, Polymerizability, and Recyclability: Dithiolactone vs. Dilactone
作者:Yanchao Wang、Maosheng Li、Jinlong Chen、Youhua Tao、Xianhong Wang
DOI:10.1002/anie.202109767
日期:2021.10.4
chemically recyclable polymers represents a greener alternative to landfill and incineration and offers a closed-loop strategy toward a circular materials economy. However, the synthesis of chemically recyclable polymers is still plagued with certain fundamental limitations, including trade-offs between the monomer's cyclizability and polymerizability, as well as between polymer's depolymerizability and
Asymmetric Michael Addition of Substituted Rhodanines to α,β-Unsaturated Ketones Catalyzed by Bulky Primary Amines
作者:Feng Yu、Haoxiang Hu、Xiaodong Gu、Jinxing Ye
DOI:10.1021/ol300489q
日期:2012.4.20
A bulky group was introduced by design into a diamine catalyst, and a series of robust and tunable bulky chiral primary amine catalysts were developed and successfully applied in the direct conjugate addition of substituted rhodanines to alpha,beta-unsaturated ketones. High yields (up to 99%) and excellent diastereoselectivities (up to 99:1 dr) and enantioselectivities (up to 98% ee) were observed.
Tanabe, Yoo; Yamamoto, Hitomi; Murakami, Masanari, Journal of the Chemical Society. Perkin transactions I, 1995, # 7, p. 935 - 948