2-hydroxyamide derivatives are produced based on the kineticresolution of racemic 2-hydroxyamides with a diphenylacetyl component and (R)-benzotetramisole ((R)-BTM), a chiral acyl-transfer catalyst, via asymmetric esterification and acylation. It was revealed that a tertiary amide can be used with this novel protocol to achieve high selectivity (22 examples; s-value reaching over 250). The resulting chiral
Stereocontrolled Synthesis of Fluorinated Isochromans via Iodine(I)/Iodine(III) Catalysis
作者:Joel Häfliger、Olga O. Sokolova、Madina Lenz、Constantin G. Daniliuc、Ryan Gilmour
DOI:10.1002/anie.202205277
日期:2022.7.25
A chiral II/IIII catalysis platform is reported to facilitate the fluorocyclization of 2-vinyl benzaldehydes thereby generating novel fluorinated isochromans in a single operation (up to >95 : 05 d.r. and 97 : 03 e.r.). Not only does the benzylic fluoride shield an oxidatively labile position, X-ray analyses demonstrate that the [CH2-CHF] fragment functions as a stereoelectronic mimic of the O-CH(OR)
据报道,手性 I/I III催化平台可促进 2-乙烯基苯甲醛的氟环化,从而在一次操作中生成新型氟化异色满(高达 >95: 05 dr . 和 97: 03 er .)。氟化苄不仅屏蔽了氧化不稳定的位置,X射线分析还表明[CH 2 -CHF]片段起到了O -CH(OR)乙缩醛基序的立体电子模拟物的作用。