Friday, May 28, 2010

reductive deoxygenation of vinlyl or aryl triflate

Some conditions:

1. pd(PPh3)4/Bu3SnH/THF.
works for vinyl triflate.

2. pd(OAc)2/DPPF/Formic acid/TEA/Bu3SiH/DMF, 50C
works for electron-rich aryl triflate.

a graphic rss feed of wiley publications

You can subscribe on these tuned feeds:

Angewandte Chemie International Edition
Advanced Materials
ChemInform
Chemistry - A European Journal
Chemistry - An Asian Journal
European Journal of Organic Chemistry
Advanced Synthesis Catalysis

You can get a completed description in the following page:

http://sulflower.com/?page_id=5040

Wednesday, May 26, 2010

proposal of synthesis of namenamicin

Namenamicin is a enediyne.
the construction of the sulfur-containing quartery center is the critical part of the synthesis. This proposal uses a thionium ion to directly form the quartery center which can lead to the desired structure in an efficient way.


Tuesday, May 25, 2010

proposal of synthesis of dictyolactone

1.The target is quite an interesting molecular.
2. This proposal mainly aims at the application of C-H insertion in total synthesis.

Sunday, May 2, 2010

How to convert indole to tryptamine ?

1. POCl3-DMF to make the indole aldehyde,
2.nitromethane to make unsaturated nitro indole.
3. LAH reduction to give you tryptamine.

to save one step, step 1 and 2 can be made into one step:
TFA, (CH3)2N-CH=CH-NO2, DCM to make the unsaturated nitro indole.

to increase the functional group compatibility of this sequence,
the LAH reduction step can be replaced by a 2 step sequence:
1. NaBH4/SiO2 reduction to take off the double bond.
2. Fe/AcOH reduction to convert the nitro group to amine.