33192-00-6Relevant articles and documents
Catalytic Asymmetric [4 + 1] Annulation of Sulfur Ylides with Copper-Allenylidene Intermediates
Wang, Qiang,Li, Tian-Ren,Lu, Liang-Qiu,Li, Miao-Miao,Zhang, Kai,Xiao, Wen-Jing
supporting information, p. 8360 - 8363 (2016/07/27)
The first copper-catalyzed asymmetric decarboxylative [4 + 1] cycloaddition of propargylic carbamates and sulfur ylides was successfully developed. This strategy led to a series of chiral indolines with synthetically flexible alkyne groups in good yields and with high enantio- and diastereoselectivities (up to 99% yield, 98% ee, and >95:5 dr). A possible mechanism and stereoinduction mode with copper-allenylidenes were proposed as the possible dipolar intermediate.
Gold-catalyzed carbene transfer to alkynes: Access to 2,4-disubstituted furans
Kramer, Soren,Skrydstrup, Troels
supporting information; experimental part, p. 4681 - 4684 (2012/06/30)
Furans of gold: The first example of a gold-catalyzed intermolecular addition of carbon ylides to terminal alkynes is reported (see scheme; DCE=dichloroethane, Tf=trifluoromethanesulfonyl). Subsequent intramolecular trapping of the generated gold carbene completes a formal [3+2] cycloaddition, which represents a novel synthesis of 2,4-disubstituted furans. Copyright
Pyrazole derivatives from azines of substituted phenacyl aryl/cyclohexyl sulfides and their antimycobacterial activity
Manikannan, Ramaiyan,Venkatesan, Ramaiyan,Muthusubramanian, Shanmugam,Yogeeswari, Perumal,Sriram, Dharmarajan
supporting information; experimental part, p. 6920 - 6924 (2011/02/22)
Azines derived from substituted phenacyl aryl/cyclohexyl sulfide on treatment with excess phosphorous oxychloride in N,N-dimethylformamide have been found to yield two isomeric pyrazoles in each case. A plausible mechanism has been suggested for the forma