+++ 2 статьи ScienceDirect. (спасибо macro)

[Redmannn]

Добрый день, помогите достать статьи, пожалуйста.

1.
Synthesis of tadalafil (Cialis) from l-tryptophan
Sen Xiaoa, Xiao-Xin Shi, a, , Jing Xinga, Jing-Jing Yana, Shi-Ling Liua and Wei-Dong Lua
Tetrahedron: Asymmetry
Volume 20, Issue 18, 23 September 2009, Pages 2090-2096

DOI:

http://dx.doi.org/10.1016/j.tetasy.2009.07.048

2.
Highly stereoselective Pictet–Spengler reaction of d-tryptophan methyl ester with piperonal: convenient syntheses of Cialis (Tadalafil), 12a-epi-Cialis, and their deuterated analogues
Xiao-Xin Shi, a, , Shi-Ling Liua, Wei Xua and Yu-Lan Xu
Tetrahedron: Asymmetry
Volume 19, Issue 4, 4 March 2008, Pages 435-442

DOI:

http://dx.doi.org/10.1016/j.tetasy.2007.12.017

Зарание большое спасибо

[macro]

[Redmannn]

Спасибо