Chemical Synthesis of [<sup>2</sup>H]-Ethyl Tosylate and Exploration of Its Crypto-optically Active Character Combining Complementary Spectroscopic Tools
作者:Timothée Naret、Philippe Lesot、Andrew R. Puente、Prasad L. Polavarapu、David-Alexandre Buisson、Jeanne Crassous、Grégory Pieters、Sophie Feuillastre
DOI:10.1021/acs.orglett.0c03219
日期:2020.11.20
is reported the synthesis of two new deuterated chiral probes, (R)- and (S)-[2H]-ethyl tosylate, obtained with highenantiomeric excesses. Due to their crypto-optically active properties, the discrimination of each enantiomer is challenging. Whereas their enantiopurity is determined by 2H NMR in chiral anisotropic media, their identification was performed by combining quantum chemical calculations and
小手性分子是突破对映歧视技术的极好选择。在此报道了以高对映体过量获得的两种新的氘代手性探针,(R)-和(S)-[ 2 H]-甲苯磺酸乙酯的合成。由于它们具有密码光学活性,因此区分每种对映异构体具有挑战性。尽管它们的对映体纯度是通过2 H NMR在手性各向异性介质中确定的,但其鉴定是通过结合量子化学计算和振动圆二色性分析来进行的。
Formal and improved synthesis of enantiopure chiral methanol
作者:Anna Schweifer、Friedrich Hammerschmidt
DOI:10.1016/j.tet.2008.05.091
日期:2008.8
[D2]Methanol was converted to the carbamate derived from 2,2,6,6-tetramethylpiperidine. It was metalated with s-BuLi/TMEDA at -78 C with a high primary kinetic isotope effect to give an n.-oxymethyllithium, which was silylated with chlorodimethylphenylsilane. The silylmethyl carbamate formed was lithiated and borylated with the borate derived from tert-butanol and (R,R)-1,2-dicyclohexylethane-7,2-diol to give diastereomeric boronates, which were separated by preparative HPLC and can in principle be converted to enantiopure chiral methanols. Thus, both enantiomers are easily accessible in nine linear steps. (C) 2008 Elsevier Ltd. All rights reserved.