Full Research Paper Flexible synthetic routes to poison-frog alkaloids of the 5,8-disubstituted indolizidine-class I: synthesis of common lactam chiral building blocks and application to the synthesis of (-)-203A, (-)-205A, and (-)-219F Naoki Toyooka Dejun Zhou Hideo Nemoto H. Martin Garraffo Thomas F. Spande John W. Daly Beilstein Journal of Organic Chemistry 2007 3:29 2007-09-28 10.1186/1860-5397-3-29 Beilstein-Institut http://creativecommons.org/licenses/by/2.0 text/html en Beilstein Journal of Organic Chemistry 2007-09-28 3 1 Full Research Paper 29 1860-5397-3-29 29 3 10.1186/1860-5397-3-29 1860-5397 http://www.beilstein-journals.org/bjoc/content/3/1/29 1 2 3 4 5 6 Beilstein Journal of Organic Chemistry http://www.beilstein-journals.org/bjoc/content/html/1860-5397-3-29.html http://www.beilstein-journals.org/bjoc/content/pdf/1860-5397-3-29.pdf