Direct anodic (thio)acetalization of aldehydes with alcohols (thiols) under neutral conditions, and computational insight into the electrochemical formation of the acetals
A versatile protocol for the production of acetals/thioacetals by means of direct electrochemical oxidation is developed here under neutral conditions, providing (thio)acetals with good functional group tolerance and a wide scope for both aldehydes and (thio)alcohols. DFT calculations reveal that direct electron transfer from the anode plays a key role in carbonyl activation during this acid free acetalization
Synthesis and solvent sorption characteristics of new types of tartaric acid, lactic acid and TADDOL derived receptor compounds
作者:Diana Eißmann、Felix Katzsch、Edwin Weber
DOI:10.1016/j.tet.2015.07.061
日期:2015.10
followed by transacetalisation and hydrolysis of the corresponding esters in the final step of the synthetic routes. The derivatives of lactic acid have been prepared on a similar reaction sequence but with the use of lacticesters. The TADDOL derivatives were obtained by Grignard reaction between phenylmagnesium bromide and tartaric esters. Optical rotation data are specified for each compound including
Direct catalytic alkynylation of N-unprotected trifluoromethyl ketimines allowed an unprecedented direct access to N-unprotected α-tetrasubstituted primary amines without additional deprotection steps.
Several ferrocenophanes, in which the two cyclopentadienyl rings are linked by acetylenic and olefinicbonds and aromatic rings, have been synthesized via the titanium-induced reductive coupling of the corresponding formyl compounds. The structures of these ferrocenophane compounds were determined by means of their IR and NMR spectra. The transannular π-electronic interactions between the two chromophores
已经通过钛诱导的相应甲酰基化合物的还原偶联合成了几种二茂铁,其中两个环戊二烯基环通过炔键和烯键以及芳环连接。这些二茂铁化合物的结构是通过它们的 IR 和 NMR 光谱确定的。在电子光谱的基础上检查了两个发色团之间的跨环 π-电子相互作用。
C1-Symmetric Rh/Phebox-Catalyzed Asymmetric Alkynylation of α-Ketoesters
Thinking outside the box: A newly developed C1‐symmetric Rh/Phebox complex efficiently catalyzed the asymmetricalkynylation of α‐ketoester 1 with various aryl and alkyl substituted terminal alkynes to provide the corresponding chiral tertiary propargylic alcohols with up to 99 % ee (see scheme; TMS=trimethylsilyl).