Disclosed herein is the preparation of functional group containing amine-boranes from the corresponding amines. The mild reaction conditions allow for the direct preparation of several hitherto inaccessible amine-boranes containing a functional moiety, such as but not limited to, alkene, alkyne, hydroxyl, thiol, acetal, ester, amide, nitrile, nitro, and alkoxysilane.
Activation of sodium borohydride <i>via</i> carbonyl reduction for the synthesis of amine- and phosphine-boranes
作者:P. Veeraraghavan Ramachandran、Henry J. Hamann、Randy Lin
DOI:10.1039/d1dt03495b
日期:——
carbonyl reduction by sodiumborohydride is described. Unlike the prior bicarbonate-mediated protocol, which proceeds via a salt metathesis reaction, the carbon dioxide-mediated synthesis proceeds via reduction to a monoformatoborohydride intermediate. This has been verified by spectroscopic analysis, and by using aldehydes and ketones as the carbonyl source for the activation of sodiumborohydride. This
Amine-boranes as Dual-Purpose Reagents for Direct Amidation of Carboxylic Acids
作者:P. Veeraraghavan Ramachandran、Henry J. Hamann、Shivani Choudhary
DOI:10.1021/acs.orglett.0c03184
日期:2020.11.6
Amine-boranes serve as dual-purpose reagents for direct amidation, activating aliphatic and aromatic carboxylicacids and, subsequently, delivering amines to provide the corresponding amides in up to 99% yields. Delivery of gaseous or low-boiling amines as their borane complexes provides a major advantage over existing methodologies. Utilizing amine-boranes containing borane incompatible functionalities
Amine–boranes bearing borane-incompatible functionalities: application to selective amine protection and surface functionalization
作者:P. Veeraraghavan Ramachandran、Ameya S. Kulkarni、Yan Zhao、Jianguo Mei
DOI:10.1039/c6cc06031e
日期:——
The first general open-flasksynthesis of amine-boranes with inexpensive and readily available sodium borohydride, sodium bicarbonate, water, and the desired amines is described. Even amines bearing borane-reactive functionalities, such as...