One-Pot Synthesis of Lactams Using Domino Reactions: Combination of Schmidt Reaction with Sakurai and Aldol Reactions
作者:Chan Woo Huh、Gagandeep K. Somal、Christopher E. Katz、Huaxing Pei、Yibin Zeng、Justin T. Douglas、Jeffrey Aubé
DOI:10.1021/jo901843w
日期:2009.10.16
A series of domino reactions in which the intramolecular Schmidtreaction is combined with either a Sakurai reaction, an aldol reaction, or both is reported. The Sakurai reaction of an allylsilane with an azido-containing enone under Lewis acidic conditions followed by protonation of the resulting titanium enolate species allowed for a subsequent intramolecular Schmidtreaction. Alternatively, the
In Situ Generation and Intramolecular Schmidt Reaction of Keto Azides in a Microwave-Assisted Flow Format
作者:Thomas O. Painter、Paul D. Thornton、Mario Orestano、Conrad Santini、Michael G. Organ、Jeffrey Aubé
DOI:10.1002/chem.201100768
日期:2011.8.22
Go with the flow! A method for conversion of keto halides to lactams by means of sequential azidation and intramolecularSchmidtreaction in a combined flowformat is described (see scheme; MWI=microwave irradiation, TFA=trifluoroacetic acid).
Sequenced reactions with samarium(II) iodide. Intermolecular ketyl-olefin coupling/intramolecular nucleophilic acyl substitution for the preparation of six-, seven-, and eight-membered carbocycles
作者:Gary A Molander、Masakazu Sono
DOI:10.1016/s0040-4020(98)00584-5
日期:1998.8
A samarium(II) iodide-promoted sequence consisting of an intermolecular ketyl-olefin coupling followed by an intramolecular nucleophilic acyl substitution is described. This process leads to functionalized six- to eight-membered monocyclic and bicyclic ring systems in moderate to good yields.
Sequenced Reactions with Samarium(II) Iodide. A Complementary Annulation Process Providing Access to Seven-, Eight-, and Nine-Membered Carbocycles
作者:Gary A. Molander、Fouzia Machrouhi
DOI:10.1021/jo990216n
日期:1999.5.1
Samarium(II) iodide promotes an efficient one-pot annulation reaction between omega-iodo esters and 2-(omega-chloroalkyl)cycloalkanones. An initial intermolecular carbonyl addition reaction between the iodo ester and the ketone generates a lactone intermediate. The lactone undergoes a subsequent nucleophilic acyl substitution reaction with an organosamarium derived from the chloride. Nickel(II) iodide is an efficient catalyst for the first step of the process, and light is utilized to promote the second step. Seven-, eight-, and nine-membered rings can be accessed by this sequential dianionic process. This annulative approach to carbocycles is complementary to previously reported procedures.
Fang, Chenglin; Suganuma, Kyoko; Suemune, Hiroshi, Journal of the Chemical Society. Perkin transactions I, 1991, # 6, p. 1549 - 1554