Silver(I)-Catalyzed Aminocyclization of 2,3-Butadienyl and 3,4-Pentadienyl Carbamates: An Efficient and Stereoselective Synthesis of 4-Vinyl-2-oxazolidinones and 4-Vinyltetrahydro-2H-1,3-oxazin-2-ones
Silver(I)-Catalyzed Aminocyclization of 2,3-Butadienyl and 3,4-Pentadienyl Carbamates: An Efficient and Stereoselective Synthesis of 4-Vinyl-2-oxazolidinones and 4-Vinyltetrahydro-2H-1,3-oxazin-2-ones
Rhodium‐Catalyzed Asymmetric Intramolecular Hydroamination of Allenes
作者:Dino Berthold、Arne G. A. Geissler、Sabrina Giofré、Bernhard Breit
DOI:10.1002/anie.201904833
日期:2019.7.15
The rhodium‐catalyzed asymmetric intramolecular hydroamination of sulfonyl amides with terminal allenes is reported. It provides selective access to 5‐ and 6‐membered N‐heterocycles, scaffolds found in a large range of different bioactive compounds. Moreover, gram scale reactions, as well as the application of suitable product transformations to natural products and key intermediates thereof are demonstrated
Palladium-Catalyzed Stereoselective Allylaminocyclization and 1,3-Butadien-2-ylaminocyclization of Allenyl Tosylcarbamates
作者:Masanari Kimura、Shuji Tanaka、Yoshinao Tamaru
DOI:10.1021/jo00117a031
日期:1995.6
Palladium [PdCl2(PhCN)(2) or Pd-2(dba)(3) . CHCl3 (dba = dibenzylideneacetone)], in the presence of a base (Et(3)N or K2CO3) in THF at room temperature, catalyzes an allylaminocyclization of 2,3-butadienyl tosylcarbamates 1 with allylic chlorides to selectively provide trans-4,5-disubstituted 2-oxazolidinones 2 in good yields. Under similar conditions, Pd(PPh(3))(4) catalyzes an N-allylation of 1 to give 3. A limited number of 3,4-pentadienyl tosylcarbamates 5 undergo the allylaminocyclization to provide tetrahydro-1,3-oxazin-2-ones 6. In the absence of an allylic chloride, Pd(PPh(3))(4) and PdCl2(PhCN)(2) catalyze a formal dimerization of 1 to provide C-4-triene-substituted 2-oxazolidinones 4 in moderate to good yields.
Palladium(0)-catalyzed coupling of allenyl N-tosylcarbamates with hypervalent iodonium salts
作者:Suk-Ku Kang、Tae-Gon Baik、Yun Hur
DOI:10.1016/s0040-4020(99)00340-3
日期:1999.5
The palladium Pd(PPh3)(4)-catalyzed coupling reaction of allenyl N-tosylcarbamates with hypervalent iodonium salts afforded the cyclized trans-5-substituted oxazolidinones, 3-oxazin-2-ones, and higher membered carbamates under mild conditions, (C) 1999 Elsevier Science Ltd. All rights reserved.
Pd2+-catalyzed oxidative aminocarbonylation of O-2,3-butadienyl and O-3,4-pentadienyl N-tosylcarbamates
Pd2+-catalyzed aminocarbonylation of O-2,3-butadienyl 1 and O-3,4-pentadienyl carbamates 5 stereoselectively provides 4-(1-methoxycarbonylvinyl)-1,3-oxazolidin-2-ones 2 and 4-(1-methyoxycarbonylvinyl)-1,3-oxazin-2-ones 6, respectively, in high yields.