Strigolactone Analogues with a D-Ring Modified at C-2

Area of Science:

• Plant Science
• Hormone Research
• Organic Chemistry

Background:

• Strigolactones (SLs) are crucial plant hormones involved in various growth processes.
• SLs are exuded by plant roots and act as germination stimulants for parasitic weeds.
• Natural SL synthesis is complex, driving the search for simplified analogues with retained bioactivity.

Purpose of the Study:

• To investigate modified D-ring strigolactone analogues.
• To synthesize SL analogues with a methyl group at C-2 of the D-ring.
• To assess the impact of structural modifications on SL bioactivity.

Main Methods:

• Synthesis of modified strigolactone analogues using GR24 and Nijmegen-1 ABC-scaffolds.
• Utilized chlorobutenolides for improved coupling reactions compared to bromides.
• Conducted bioassays to evaluate the germination stimulant activity of the synthesized analogues.

Main Results:

• The coupling reaction efficiency was significantly higher with chlorobutenolides.
• The introduction of a methyl group at C-2 of the D-ring did not affect germination activity.
• The bioactivity of the modified SL analogues was comparable to natural SLs.

Conclusions:

• Modified strigolactone D-ring variants with a C-2 methyl group retain significant bioactivity.
• The findings provide valuable insights into the mode of action of strigolactones.
• Simplified strigolactone analogues represent promising candidates for future research and applications.