Pd(OAc)2-catalyzed coupling/cyclization of 2,3-allenoic acids and methyl propiolate: observation of double 1,7-hydrogen shifts.
Gu
Zhenhua
Z
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, PR China.
Ma
Shengming
S