Divergent Regioselectivity in the Synthesis of Trisubstituted Allylic Alcohols by Nickel- and Ruthenium-Catalyzed Alkyne Hydrohydroxymethylation with Formaldehyde
作者:Cory C. Bausch、Ryan L. Patman、Bernhard Breit、Michael J. Krische
DOI:10.1002/anie.201101496
日期:2011.6.14
Stoichiometric metals banned: Nonsymmetrically disubstituted alkynes were converted into primary trisubstitutedallylicalcohols upon exposure to paraformaldehyde in the presence of nickel or ruthenium catalysts, which exhibit complementary regioselectivity and complete stereoselectivity in the absence of exogenous reducing agents (see scheme).
This present disclosure is related to the field of 5-fluoro pyrmidines and their derivatives and to the use of these compounds as fungicides.
本公开涉及 5-氟吡啶及其衍生物领域,以及这些化合物作为杀菌剂的用途。
Copper-Catalyzed Stereospecific Hydroboration of Internal Allylic Alcohols
作者:Enhui Ji、Haiwen Meng、Yue Zheng、Velayudham Ramadoss、Yahui Wang
DOI:10.1002/ejoc.201901435
日期:2019.11.30
Copper‐catalyzed highly stereospecific hydroboration of internal allylic alcohols using a silyl ether transient protection strategy is reported. This in situ protection effectively avoids the preferential side reaction of free hydroxyl group with boron reagent, thus promoting hydroboration. This method provides both the anti‐ and the syn‐ diastereomers of 1,3‐diols in high level of diastereomeric ratios
Selective construction of quaternary stereocentres in radical cyclisation cascades triggered by electron-transfer reduction of amide-type carbonyls
作者:Huan-Ming Huang、Pablo Bonilla、David J. Procter
DOI:10.1039/c7ob00739f
日期:——
Radical cyclisation cascades triggered by electron-transfer to amide-type carbonyls using SmI2–H2O–LiBr, result in the selective construction of quaternary carbon stereocentres.