Heck-Stille cascade stannane termination

D.ii.b. Termination by Stannanes (Heck-Stille Cascade). Stannanes have been used... 

B.ii.b. Termination by Boronates (Heck-Suzuki Cascade), Stannanes (Heck—Stille Cascade), or Cyanide Ion. The Heck reaction of aryl or alkenyl halides with norbomene can be terminated by coupling with either a boronate (Scheme 5, Eq. or an alkenylstannane (Scheme 5, Eq. 2) to stereoselectively formed vicinal biscoupling products with formation of two new C,C bonds. 

Another intriguing cascade of an intramolecular Heck-type reaction followed by an intermolecular Stille coupling produces the dienyne 98 starting from the enyne 96 and the stannane 97 [322] (Scheme 8.25). The reversed sequence of a Stille-type reaction followed by a Heck reaction has also been applied. It is also possible to terminate such a sequence after transmetallation from a zincate [180a,c], either added to the reaction mixture [180a] or generated in situ from an iodoalkene [180c]. 

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See also in sourсe #XX -- [ , ]

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