Catalytic and Mechanistic Developments of the Nickel(II) Pincer Complex‐Catalyzed Hydroarsination Reaction
作者:Wee Shan Tay、Yunpeng Lu、Xiang‐Yuan Yang、Yongxin Li、Sumod A. Pullarkat、Pak‐Hing Leung
DOI:10.1002/chem.201902138
日期:——
significantly slowed the development of the catalytic asymmetric hydroarsinationreaction despite it being a highly attractive C-As bond formation methodology. In addition, there is a poor understanding of the main reaction steps in such reactions which limit further development in the field. Herein, key intermediates of the hydroarsinationreactioncatalyzed by a PCP NiII -Cl pincercomplex are presented upon
Air-stable phosphine organocatalysts for the hydroarsination reaction
作者:Wee Shan Tay、Yongxin Li、Xiang-Yuan Yang、Sumod A. Pullarkat、Pak-Hing Leung
DOI:10.1016/j.jorganchem.2020.121216
日期:2020.5
triarylphosphines are explored as organocatalysts for the hydroarsination reaction. When compared to transition metal catalysis, phosphine organocatalysis greatly improved solvent compatibility of the hydroarsination of nitrostyrenes. Upon complete conversion, arsine products were isolated in up to 99% yield while up to 48% of the phosphine catalyst was still active. A mechanism was proposed and structure-activity
Novel synthesis of α-nitroalkenes from nitroalkanes via halogenation of intermediate N,N-bis(silyloxy)enamines
作者:Roman A. Kunetsky、Alexander D. Dilman、Marina I. Struchkova、Vladimir A. Tartakovsky、Sema L. Ioffe
DOI:10.1016/j.tetlet.2005.05.113
日期:2005.8
An approach to conjugatednitroalkenes via oxidation of N,N-bis(silyloxy)enamines with bromine or iodine in the presence of tetra-n-butylammonium acetate is described. The acetate ion plays a key role by acting as a mild desilylating reagent. This new strategy allows the synthesis of α-nitroalkenes from the corresponding nitroalkanes.
QUINOLINE-OXAZOLINE COMPOUNDS AND THEIR USE IN OXIDATION SYNTHESIS
申请人:Sigman Matthew Scott
公开号:US20110054176A1
公开(公告)日:2011-03-03
A quinoline-oxazoline compound having the formula:
where one of X
1
and X
2
is N and the other is C and one of R1, R2 and R3 is Z wherein Z is an oxazoline radical having the formula
such that when X
1
is N R2 is Z and R1 is absent, and when X
2
is N either R1 or R3 is Z and R2 is absent. R1 and R3 through R12 are independently H or a pendant moiety which does not interfere with coordination of either N in the quinoline compound with a coordination center. These compounds can be complexed with a suitable coordination center such as catalytically active palladium and can be highly useful in catalytically oxidizing alkenes with high regioselectivity.
Addition of silver nitrite to 2-bromoalkyl phenyl selenide in the presence of mercury(II) chloride afforded 2-nitroalkyl phenyl selenide, which upon oxidative deselenenylation provided the conjugatednitroalkene in excellent yield.