Pictet-Spengler Route to (R)-PZQ

The Pictet-Spengler reaction is used in the current industrial synthesis of rac-PZQ, and these reactions have been looked at on the Synaptic Leap here.
 
The PS has been used in the synthesis of PZQ, and we used it as the final step in our solid phase synthesis of PZQ, but both these syntheses were racemic.
 
Catalytic, asymmetric
We have now started an Electronic Lab Notebook for the raw data for this specific aspect of the project here. Comments can be left here or there.
Essentially we need to start with literature catalysts for the catalytic, asymmetric Pictet-Spengler reaction. We therefore need to assemble a list of these catalysts here (literature help needed from anyone please!):
1996 Nakagawa
1998 Nakagawa
2004 Jacobsen
2007 Jacobsen
2009 Franzen
2010 Wu et al.
2010 Jacobsen
Need more candidate catalysts!
 
We are looking for people to help screen known catalysts for the relevant reaction. If your lab has any such catalysts we can send you starting material to screen. Substantial contributors to the project will be invited to be authors on the resulting papers.
 
Diastereoselective
Wayne Best of Epichem has suggested an alternative approach based on a PS reaction of a chiral phenylethanolamine. This is an interesting idea, since 1 to 2 (below) might work well with asymmetric induction, and the products resemble PZQ. The use of a chiral starting material, in the generation of some analogue of PZQ that contains an extra stereocentre, could be an interesting project, but it's not clear these analogs would be active.  Anyone have a suggestion for a suitable commercially-available chiral starting material? Anyone want to try this?


A chiral auxiliary-mediated PS was reported by Ma et al. (J. Chem. Res. 2004, 2004, 186-187 - paper doesn't seem to have a DOI?) where the key asymmetric step is shown below.


Other examples: Comins 1991
The use of an auxiliary is of course atom-inefficient, however, and likely to be expensive.