Prabhakaran; Nandy, Jyoti Prokash; Shukla, Shalini; Tewari, Amit; Kumar Das, Saibal; Iqbal, Javed Tetrahedron Letters, 2002, vol. 43, # 36 p. 6461 - 6466 doi: 10.1016/S0040-4039(02)01236-4