Oxidation–Reduction Condensation of Diazaphosphites for Carbon–Heteroatom Bond Formation Based on Mitsunobu Mechanism
作者:Hai Huang、Jun Yong Kang
DOI:10.1021/acs.orglett.6b03709
日期:2017.2.3
An efficient oxidation–reduction condensation reaction of diazaphosphites with various nonacidic pronucleophiles in the presence of DIAD as a weak oxidant has been developed for carbon–heteroatombond formation. This mild process affords structurally diverse tertiary amines, secondary amines, esters, ethers, and thioethers in moderate to excellent yields. The selective synthesis of secondary amines
carbon–heteroatom (C–P, C–O, C–S, and C–N) bonds via C–N cleavage of benzyl ammoniumsalts under transition-metal-free conditions was reported. The combination of t-BuOK and 18-crown-6 enabled a wide range of substituted benzyl ammoniumsalts to couple readily with different kinds of heteroatom nucleophiles, i.e. hydrogen phosphoryl compounds, alcohols, thiols, and amines. Good functional group tolerance was demonstrated
Convenient MW-Assisted Synthesis of Unsymmetrical Sulfides Using Sulfonyl Hydrazides as Aryl Thiol Surrogate
作者:Neetu Singh、Rahul Singh、Dushyant S. Raghuvanshi、Krishna Nand Singh
DOI:10.1021/ol402948k
日期:2013.11.15
An efficient synthesis of unsymmetricalsulfides has been achieved via the cross-coupling reaction of aryl/het-aryl/benzyl halides with stable and easily workable sulfonyl hydrazides as thiol substitutes by means of [DBU][HOAc] and CuI under microwave irradiation.
A practical nickel‐catalysed approach has been developed for the CS bondformation through the cross‐coupling of arylsulfonyl hydrazides and aryl boronic acids. The report employs arylsulfonyl hydrazide as an aryl thiol equivalent and offers a mild and eco‐safe synthesis of unsymmetrical thioethers in good to excellent yields in air. The scope and versatility of the method has been successfully demonstrated